Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad0fa01959edd12b…

MALICIOUS

PDF

88.0 KB Created: 2021-07-15 20:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 4555925569326649ba72e2dc9a113fd7 SHA-1: e7cb3c29a8c2efb5a1207785e82ebbdbfcd8bc52 SHA-256: ad0fa01959edd12bd6e5e3153cd50e8aebb40112311cc8380ec6577af35e6648
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the nature of the document as a deceptive link collection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://geneticapanama.com/userfiles/file/21413088267.pdf In PDF document text
    • http://jwnorthclassof70reunion.com/clients/c/c6/c6167e942b76adab5863fbee8ae727a7/File/lewotavi.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d222252103d---panumelebitasusedi.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/ravupomibum.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/99f035r6m4666ai6me517ufjt4/funufawanepokibodap.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dd600c914f6---66771127122.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/raxebiwolasulezavedego.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/wurozanetil.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078752b2a81d---lemiv.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/fumuwevekaj.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021070503153280554.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/c693lbtfs7s7ib1ov9tnsd86q3/lemimevojoxizin.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/78195374888.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/205b5c9cf3638fbbbc9d58e5c8b133d1/86877922124.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/96467756104.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f80f184ff3---88737942772.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/76825234306.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/65102193265.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/8d4db0898eae3c070941e7423456660c/20780343772.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e41338e3c---fibabazemo.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/jexajivi.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021061417283880554.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608623385c6f5---84468299242.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=cmat+previous+year+question+papersPDF 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_off0000f4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD6 10824 bytes
SHA-256: 7a763235576e917c20f4ad59e85927e6615e2511bf313e1abc8c1d6a260ca2b0
font_02_sfnt_off000125d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D3 17148 bytes
SHA-256: 865480c41c07bc02a0ac0de7ee796d399910f311c44529ee40889331ea9e477d