Malicious PDF — malware analysis report

Static analysis result for SHA-256 97b82cbe952b4b9b…

MALICIOUS

PDF

84.0 KB Created: 2021-09-17 02:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b0dbdb9bea76259a4d4ddab0529b594c SHA-1: b92bb4e036dde1b9db060fd074048b95a44f3e80 SHA-256: 97b82cbe952b4b9bcfddbb175b6d4a2293d0fdd9a3b7e6b0f95825d33410563c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing multiple links to potentially compromised websites and a URL that appears to be a download lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=sex+live+mod+apk PDF link annotation
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/8dd3084c707f6773d82a8db3f325a51b/33942506540.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/47166761009.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/xufud.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/lalorila.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/jibuzenuruwufolibekefogi.pdfIn PDF document text
    • https://nhomphuongnam.com/upload/files/xapefukesatezexaj.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/bca301760ab72e40caa7d45096cda66f/rulorowuzuxokixijebis.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/94495201198.pdfIn PDF document text
    • http://sjhtractor.com/d/files/jepinetesirafitufiko.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/xetovobumizavineruk.pdfIn PDF document text
    • https://buyafranchise.org/files/files/77833558168.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/zikit.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/57bd36338369226d47861c2aa73c3fc0/68278278490.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/badigovumiwuk.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/6256296332.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/e4f8cc015c14c35c2324aac04ed1c5c4/vonezixisetedip.pdfIn PDF document text
    • http://msiutilities.biz/documents/65314080901.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/54510942452.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161404380c8f3d---futum.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/wifidozodadasolafusig.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/40625688976.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/keniredabijiguzuve.pdfIn PDF document text
    • https://j26clean.com/upload/files/sorutanenete.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_off0000dcfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFC 10420 bytes
SHA-256: 9b00dbd960c5591bf6fe56cb9f32ba72e060b9c07441a3799f717ee00cdf9557
font_01_sfnt_off0000f49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49A 20520 bytes
SHA-256: fc7f0ef474ab301a6fc86a4684c76ad6feb180203de8cc085b4235b15f4c7100
font_02_sfnt_off00012ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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