Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f0b91f8785defc7…

MALICIOUS

PDF

74.2 KB Created: 2021-08-31 06:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9e982c2a109c4e3e7a7b4435623abfb5 SHA-1: bf1f7dfc1219b695da7670574ee03795f6dfdc29 SHA-256: 3f0b91f8785defc7052d53fdaacb7e1e1616146696de93d8ff23556cf881818f
164 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress sites, likely to facilitate further malicious downloads or phishing attempts. The presence of external URIs and the 'download button' lure suggest a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=metal+slug+x+free+download+for+android PDF link annotation
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef4a310f72---84825476388.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/55566076629.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/fc550a6lemlmpo8c07foj49i0h/27011974757.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fecae08305---43673087235.pdfIn PDF document text
    • http://aa-nusd.jp/72773344364.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210718195228073.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/014cae639e4bb90e6a0410323be0cffe/51678243207.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cace1a32c---9903801892.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/bovobupirifedutupize.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071d2f5b520c---72557562417.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/rigir.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/71534432259.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/97291927197.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/80895676424.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a4b8f03c6---84616628583.pdfIn PDF document text
    • https://turbooto.vn/upload/files/43244927004.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afd004c8545---pewojabiwowukefirogono.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///93220261133.pdfIn PDF document text
    • https://biocoils.com/img/file/10425855976.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/0a214dae1b896367e7b14b32f2c4a851/392019681.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/49796546103.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/vubopozowamewupidexof.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/5cb81ced9a59fc517e5697c0b5dba5d0/zanowekubomerovefeditupu.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160853e2a8a6b3---titimexeva.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_off0000be12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE12 10812 bytes
SHA-256: 0dc9a27be35afc5f94e2874b962c530da0aa128bd00ba6171f93d86c877c0e35
font_01_sfnt_off0000d702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD702 17016 bytes
SHA-256: 517bf14eb9622a854d7766346ba8598bff5742e8947f0f536f01c08be52ce50e
font_02_sfnt_off000102ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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