Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa499ef96592665…

MALICIOUS

PDF

77.3 KB Created: 2021-09-03 19:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d36030101fa6ae1117367e16891c64de SHA-1: a5f4f4e741abb8f1de91df6983d8862876ccb970 SHA-256: 3aa499ef965926654f79bbc0ae2d765e654fadc3aaf17bf2ff6f98e7fcc65697
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to external resources, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of a callback lure heuristic indicates a potential for social engineering to trick users into further interaction. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://krisoc.ru/uplcv?utm_term=bowflex+revolution+xp+assembly+manual PDF link annotation
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853665d0aa2---63783548652.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/61768433208.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f2a89215f---29282132068.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f781d0e7a31---muwutudenufopotet.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/pulonen.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/vusemiripuxejo.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/68593637176.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16092289021424---baxufiwalunu.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/02dfdeee3dbd4fdf2a65f75f82408f5c/93087392389.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/49573351275.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/98536875726.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/vubevedixiwiwegaja.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e21655c4a67---gewojokumesumumodafizi.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/0601f2b2db4b4ab15d5bc9217ad81a4c/kurozoxij.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/voxujixifetugorukumi.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/gubegedemajuboxomipoluw.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d70a3c9cac7---linamotitivazerurimuguli.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/tofomiri.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/39962571919.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/73306673297.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/dcc40fd880514274252206e9891613b8/givagorufujufid.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/jobofedifelo.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210825080329.pdfIn PDF document text
    • http://fairytaleweddingsandeventsbymary.com/clients/f/f2/f272f95a0afb65faa7304057ec0e56f6/File/26114317554.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/bofizuz.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160f5659ae99a7---90016981525.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA45 16520 bytes
SHA-256: a2d14d2d6f311ba4913ed90d30d201ae21dd4549c60e9caf3abcf6cf5839949b
font_01_sfnt_off0000f4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFC 11180 bytes
SHA-256: 57bfabee32609b422dd035cc95b2d5a5a7372976cb8c3d322ca2b5ff1b24baf1

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