Malicious PDF — malware analysis report

Static analysis result for SHA-256 38f88aed320d4a6f…

MALICIOUS

PDF

82.6 KB Created: 2021-09-07 09:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a1d35258fb2415d12de5430e2a56597f SHA-1: bc011942557503c8072774ad0010bf4a5c482a01 SHA-256: 38f88aed320d4a6f7a5df7800c2e224eb55b4e341b8873c05f20b4b1cfc156e2
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were directly extracted, the PDF structure and embedded links are indicative of exploitation for client execution, potentially involving JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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 http://lab4050.com/upload/editor/file/18133426059.pdf In PDF document text
    • http://rgn2u.com/userfiles/files/mibitapijovigojone.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/tedagolajof.pdfIn PDF document text
    • http://all-premium.com/user_file/files/bogewafatikevugibe.pdfIn PDF document text
    • http://hidropro.hu/upload/tosexupagenekikinibugov.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/3ti1jpg67eftonr527i5fgkav6/guporivox.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/xumorifek.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/97789456530.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/kgmpjmu8rpsup0k10dr2foamuj/52617217335.pdfIn PDF document text
    • https://hifi-markt.eu/kunden/kronhardt/ckfinder/userfiles/files/xoforodinomemuwo.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/tixameboxirodilevit.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/88497569109.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/61851048670.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16109b9e85cdb4---99174341787.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/sakanumusiwikideser.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/3513706087.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/48364278556.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/97a35f627bb052d1a9e6f3a00815b0ff/robusuvilaluri.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/2a317841955a22f83fa774292b0a36fc/98574974947.pdfIn PDF document text
    • http://rford67613.com/clients/a/a2/a20594cba7d6fe247bc87ef9b80620db/File/zulowalorixisibi.pdfIn PDF document text
    • http://charivne.info/images/file/32983042918.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/ruzotewufefije.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/64953011856.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/tusukab.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef79a1acc8---lofozofimebadonebufoxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=kusumagraj+kavita+books+pdfPDF link annotation
    • 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_off0000d1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CE 21172 bytes
SHA-256: 68b56146ed0d38f74612e77952d74dd55e6aa73d22a20c8bea019fae0c45c87f
font_01_sfnt_off0001095d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095D 11076 bytes
SHA-256: 9714c0bff6cd0850170e663763f75dc9c08d262506dff0453b0f27bec16c1f40
font_02_sfnt_off000122c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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