Malicious PDF — malware analysis report

Static analysis result for SHA-256 772f41b1c0021b61…

MALICIOUS

PDF

94.7 KB Created: 2021-07-21 13:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 042add8d24e5a91cf6976529a5cee8d3 SHA-1: 8e35cf42467142b875e79aa0fc6c43a738116d3b SHA-256: 772f41b1c0021b6115410e215fa13a0caaa0cbb958a87e69db1bc13b4407686c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via embedded links. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/d85b065f92c74e5fe8e0d67357fcba9f/62286488868.pdf In PDF document text
    • http://auto-spec.ca/fck/file/mijeviluvom.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/0da4e977cd10b61924027575ac0f04b0/vozunepoxuxuworilu.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7fdeca0c2---2980241177.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/kesopalaxefiduzalo.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c97de6d6ece---62425457810.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/qf2erhmm3mp3cr5cu80dav3eg1/67451919997.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/raxabaxulezitiwava.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/6dfa3428730f29f00a581b9c38d965b1/84773196486.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c42ab1e1640---fixedipebuzebimadonivaxul.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/tobovenozevidunulazutigif.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9e8e5d4fe---40385672955.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/19721300817.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/hn0fs39qhbeunuksd4e1gr4ps4/senomuzutigo.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bed333824---gozopadasivavasevedalolol.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/49896704965.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/2210427512.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/m8h40r8dpi97m05lr5lct6vaa5/93800099613.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/mipinapabedijodisifire.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/45825887664.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c63e931ad6---jakobibej.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc36d4073a---zoguwupexewadupasij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=i+have+a+fruity+taste+in+my+mouthPDF 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_off00010e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E79 17760 bytes
SHA-256: 35eb2051918eab5d700a61671002df27185a0c19ec7567a8b72da12f9487959a
font_01_sfnt_off00013d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D54 10664 bytes
SHA-256: 15a6a0541b3d17ddcb27811ab4928e03d3d3afc852113ac96489f53a2d8ccc11
font_02_sfnt_off000155a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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