Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f2716f7ae8e0bc0…

MALICIOUS

PDF

93.8 KB Created: 2021-06-26 18:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 694b26a76da3b8be927b97a2328141a6 SHA-1: 3c409b226035660bd16a0062db756c6a2680b304 SHA-256: 0f2716f7ae8e0bc08873a1027e034b4f9b1380a2ff094097916772a610a2911f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting. The presence of external URIs and link farm heuristics strongly suggests the document's primary purpose is to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://medvor.ru/uplcv?utm_term=translate+the+sentence+into+an+equation+calculator PDF link annotation
    • http://marinapogon.pl/upload/file/pevazoradoboxodevoxav.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/62804519211.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/fobexapajenivag.pdfIn PDF document text
    • http://hf1968.com/clients/48820/File/batonuporolomoxapiteri.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/81720609122.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/noluwenefofajaxoxerimal.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa47d2857a7---43186528343.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d50e8f7ab---teruwolikapewuboguragusuz.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/6b9779ae0704ae6247bf767c0f221749/xanofavefaniliduganivetej.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c436c305225---suviwodusefuxanow.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdd24a7478---77869828237.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/89879675676.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/vj3qi57g3bhb889dv5j29rpnc3/polukinebisekivobitur.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/xufafukawajiwalotajevenom.pdfIn PDF document text
    • http://teresachild.com/upload/files/77671903706.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608bafa899344---xezokugalit.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/58005382290.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/nexoza.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/692efffad867ed09d936c933d9f6bc82/nusapesipugozeduzugirilis.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5fb72b37e0---69265457460.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088341552b60---72550564168.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/zisexufavus.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/86916857157.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/1b6401381744a1f8b1f5e3c4a3566717/tenufutuzumoxokar.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/5de74e3c37a17aa1bf742095ed53bfe7/10986081825.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf017a06cc---6161096853.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a780441020f---bumavaravitemebux.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_off0001070b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070B 10536 bytes
SHA-256: 03fa6b754976103d7d03dac6e081fab7418f57a9e97a07d6523250a9b96c2b09
font_01_sfnt_off00011f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F01 18896 bytes
SHA-256: f685a974deb963057b927032f3748628e20e2dfba5240138e4181947b7fbb654
font_02_sfnt_off00015136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15136 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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