Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a7cff89216cc0b2…

MALICIOUS

PDF

89.9 KB Created: 2021-07-25 19:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1c0ca53f2a483bf047fdeb788e42ddcd SHA-1: a26737d72bb7ca150887e0a0b8ad52febf3ab20e SHA-256: 4a7cff89216cc0b2d16adfd18d7cf095235e493337f96593da25dd476df38346
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable infrastructure. The presence of numerous unknown URLs suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://consulcongress.it/uploads/assets/file/28316766156.pdf In PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fbb07815ab4cae28757d93b51764c366/70531400304.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/zalakajuxuzotedokomafopen.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebcdee5b7d---joxab.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/76373e5a239a09a1f04524dd7bfc17cf/16801606752.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/kedomajemepukev.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/mutomugojubogupukuw.pdfIn PDF document text
    • https://beaszemin.com/files/potodamimamubanog.pdfIn PDF document text
    • https://anjingliar.com/contents//files/55308657703.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/e2f0c516fcb6aea536fdfb36e83dfae8/13004931336.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/8c33b994cdc328632b5b065c234a5738/kosemefuvutoxikegoju.pdfIn PDF document text
    • http://wearefamily1234.com/clients/3/31/31b46d3307e4516335aa88350909469c/File/41704118883.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a948df54eff---12884438058.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16081a9412e4f9---lefejimewizuwewupume.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b59063b653---zotokosetir.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/f8890c85f403af1970e3b89ab3ffb20d/43002352060.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/bb3318adaf026a847428a7a412a1e12e/kenutedugoreb.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/ffbcb5bda6636f027ff407a9e1097f89/52092203332.pdfIn PDF document text
    • https://isosklo.cz./uploads/wunipukefixojawipesuro.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ca303c5677b---sufogugeruzabosotu.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/93231295605.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/97577686883.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/jimebawofududowivadezomug.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/1357c47768331b91349dc491f3610c33/29532300816.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/32028775725.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/29379119001.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=what+are+the+120+channels+on+dish+networkPDF 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_off0000f810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF810 18440 bytes
SHA-256: fc87b26f5dbc9c6a198ae92a806a4621e5a4ef1fa7cab98d74427cae2f3ff642
font_01_sfnt_off000127e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E8 10932 bytes
SHA-256: 94d7bf9a416d829c42a8edcaefd4d30e59ced100aceed85900644eeb65ecd7f5
font_02_sfnt_off0001415c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1415C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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