Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c0677ba7d3248fa…

MALICIOUS

PDF

87.1 KB Created: 2021-06-27 22:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 42edfe4d8eb02862a8f3a4bf2ea2b53d SHA-1: d40add4e4958b30d44c486dda740aa3bc55ed2cc SHA-256: 7c0677ba7d3248fae39f7975fd58f307f1a1c339080da6d64de64fb7bae32dfe
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which appear to be compromised WordPress installations used for hosting malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://krisoc.ru/uplcv?utm_term=how+to+win+gems+in+cooking+fever
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbf0b50d92---milatidowusuxon.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160829dc071e04---fezifad.pdf
    • https://a2designbg.com/userfiles/file/80897855049.pdf
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/59489929904.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607454c18a54b---nunanuvurob.pdf
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/dbc25dd34886a7a16e8e9dd10ccbe8b2/36271661139.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/e66bb33e9fcb106af45acf9e9bb32aae/roxitejusagadeko.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/0fbf2a78e73b47cd8b38a47cc1b4d279/85922130688.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/grn55tsemtgrfu4dok9rfh71pv/mularotumuwijoma.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f384a7ecdb---94295595051.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4b06c437d---1059385237.pdf
    • http://www.dismaplant.com/ckfinder/userfiles/files/28204895933.pdf
    • http://bestofbeer.ru/ckfinder/userfiles/files/nazozepisororomimeje.pdf
    • https://amitadevnani.com/userfiles/file/6541939093.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608da363dbc2e---diwusupezut.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d7d740f50---83471253816.pdf
    • http://bawaconstructions.com/editorData/file/2506689608.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/k38cjl60eqef41u5tcmrsbnvj6/gexiruwosifezomip.pdf
    • http://asesorgubernamental.com/images/file/62869937719.pdf
    • http://nature-revive.org/files/file/fulaserasokolal.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/j6mck6cnmcu6cdf3vd9iqietfo/667153773.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087206978ec3---dikopi.pdf
    • http://elm3rad.com/file/35277980210.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f099.bin
1ee80fa698f46d4a1daa010e32858bc83b215fb548c1ea7ccb09ea49d64a3db0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF099 17492 bytes
font_01_sfnt_off00011eb1.bin
a256cfb3e4340fa264878ce6dd138aeca7805897c99eb8c60496b521b82f9b22
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB1 10704 bytes
font_02_sfnt_off00013750.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13750 16792 bytes