Malicious PDF — malware analysis report

Static analysis result for SHA-256 4754d7cc33f25049…

MALICIOUS

PDF

85.9 KB Created: 2021-07-09 05:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b18e449713551f9e38aacb8d972bf398 SHA-1: b29a4f55ac6133e9ffa2d362872949ab4128a6d3 SHA-256: 4754d7cc33f250490e0cc5c0a5aaf1280dc5598eeefed4d88e668c2f3156c60f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

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://crewmak.ru/uplcv?utm_term=structural+organisation+in+animals+class+11+questions+and+answers PDF link annotation
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/k3u6knjuhlhss07uimogi526c5/zulajubovowaresetafunud.pdfIn PDF document text
    • http://ubest.ru/images/file/9873565790.pdfIn PDF document text
    • http://overtonnation.com/clients/f/f9/f97855507a39dfa58978186db9bff07a/File/kewerasevozori.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c30a77e9af---wevalozepabapibel.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/57218878201.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/tpsuk2onsueqecvjm0ivud79ak/96942452085.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/46854473944.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/xalatexuzedujaxirurab.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/medode.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b4f28b542---17806593480.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/f7mispeu3eh27d6sgspldjori0/jopowikenufo.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/jimotomupekerofadu.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160788c108e38f---58153393586.pdfIn PDF document text
    • https://blokhol.com/upload/files/jewamokedunakotejisuvojir.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/kizejowovew.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/95119808731.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/73191436918.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a77ab457119---gevajokebilurosina.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcd4f7ed57---38905454873.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b287a295fda6be41a70b947c87c025fb/49956450528.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7effeac40---voxegi.pdfIn PDF document text
    • https://adreshosting.com/calisma2/files/uploads/zazoje.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/jugipejodododatasem.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/ba9ddde68823a363fd537570e546a931/5073992992.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tosoxegobatex.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a944be10835---xexulasazomuse.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/fiterijatatixiz.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_off0000eb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB16 11172 bytes
SHA-256: b5c035b614650e722af19ee303bdd01711f20df334c01707333ac6a85f1d22a5
font_01_sfnt_off000104c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C2 16616 bytes
SHA-256: 7150b4fd9a1610c1a8268472cdbb0aadd5aced1cbf1e146e403c1041bae8eb5f
font_02_sfnt_off00012f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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