Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc75ac95e5cb1eb…

MALICIOUS

PDF

117.2 KB Created: 2021-07-15 22:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2dd5af049b2f619e09d13d8d733106a3 SHA-1: 417cee40245b2c09ad217d449562d45af39b28fa SHA-256: cfc75ac95e5cb1eb460253faf7faff64b6c4df99452b18238eaf5a3fc7e839fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary function appears to be acting as a lure to download further malicious payloads or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://laborke.ru/uplcv?utm_term=lord+of+the+rings+differences+between+books+and+movies PDF link annotation
    • https://mariellatriolo.it/public/file/55059966007.pdfIn PDF document text
    • https://noddy.nu/images/file/lilovak.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160d0a69898090---tevarutiditemekoxaka.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/97d17b9d562e931a7b0ac1c97d11a180/disefuzesetaje.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/el2da24b77dv69uua7ik2vsd65/duruvolozekurozisexeveve.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/41710645784.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782a5422159---32111759613.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/sedirusivezodezafemo.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/fuvawamusodetabogodom.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16094c3c2bcd0b---bizotobetatosisixag.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a33b7707b3---rasawaxewaredufa.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/wixuvoju.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082aa19e2b83---82888373799.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/6d083ad4246278e383124960a9016b77/37918412579.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd34723b7df---xisapule.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/fekog.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/13738863798.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16078df8565668---dazolopudavepixegawod.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608111203c158---kikupawujogotekekaxine.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607b32a9565f5---53161163945.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/3841182225.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/33817317580.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/fad051c6ac9fbcf365a4a9441024881f/jilewuduv.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_off00016a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A68 16848 bytes
SHA-256: 4ad9bab48f85b4e41be1999be1dfeeee821ab9d247a327d109fed13783c62958
font_01_sfnt_off0001955c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1955C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ad73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD73 11216 bytes
SHA-256: e78b0446c457ae222eb4891b3e581de95f0010bd083d81e529ffcc876af9ee62

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