Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a97f679f3a5dc9…

MALICIOUS

PDF

90.5 KB Created: 2021-08-02 06:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 87b357a9d1caa7bf9fdeda7a6f13d6c3 SHA-1: 102f6d6875d35dce943e7f2537b7481c2f2aa370 SHA-256: f5a97f679f3a5dc9e7ed1d1cc78b269cbd72174dbee2e7a2f2a8b12234cb7530
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://almondzwealth.com/administrator/imagetemp/file/41802190006.pdf In PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e56d94f91---3146958519.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec97b29666---vukisovafe.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/f2d8e3d590b4881a16138b8fcd0f740b/ravadadipovun.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/17167841426.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/61164677983.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad306a03a0---81769845676.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/88112386880.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3a891f53e---70830394265.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16090e9e046997---20495387750.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/15058182496.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ead1be43b5---42344936621.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/8f727608d0fa041e492805b95aa29835/4017883656.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081f0395faa7---lejafazasurusodonaxi.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/e364674a286d1889747ff5d00a475df9/29659997451.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/38965448642.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/60049896799.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160fb865ac7a27---fetapotaki.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/50308244965.pdfIn PDF document text
    • http://portsreunion2021.com/clients/b/b1/b1889431de095b9710a1303a3c619afc/File/xipeliwiguludofor.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/dodazelezifav.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/48563458531.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899c47117e0---19195132928.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a25860c9368---56369914235.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=when+is+toyota+red+tag+days+2018PDF 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_off0000fcc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC1 17332 bytes
SHA-256: e7a61891e4588711d598ce7afa5f6c4bfbd94a8aea8598eebd9fe3a5a192d538
font_01_sfnt_off00012a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6B 11088 bytes
SHA-256: 77244d578c6491202122b28eb793915a357e7e410e0e4dffd2259b03ab5a6f42
font_02_sfnt_off0001442f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1442F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1