Malicious PDF — malware analysis report

Static analysis result for SHA-256 827256f17f235bd1…

MALICIOUS

PDF

90.3 KB Created: 2021-07-21 14:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: efbc2a8b924e6d7a238f394937f9cf51 SHA-1: f654b575ba77122daac94900ec58aad32c1c827e SHA-256: 827256f17f235bd193d3b0230e86ef05319ba6b8bb8ec8cfc8a31a83c67ae222
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm for SEO manipulation or phishing. While no scripts were explicitly extracted, the PDF structure and link farm behavior indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://vigova.vn/Images_upload/files/ginedevulon.pdf In PDF document text
    • https://asi-filter.pl/files/file/xudofisuwoxiwirupolu.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/65925260551.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/020d09bff8a043153a22d99e02bbde95/2998622136.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/gawubiremunulelalusetiv.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/lexitetodepor.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5629cbc5a5---48057092074.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0f42235b0---jezobesini.pdfIn PDF document text
    • https://promise-land.com/upload/file/67150962580.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cd4a45f46---ragemowokesotidodivuxaxis.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/7987e9f5566da16509c47819e44dca42/nosame.pdfIn PDF document text
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/fugokizonamonifiluf.pdfIn PDF document text
    • https://seerupit.dk/assens/file/vudaduginobibiwupitokaxos.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/13286687887.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/31m0l4sedfkm70afgdjkb9bgfm/18322792918.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/ea7692f5e728ace04ea90e3e50d539ef/kaxatuxapifasod.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/20791001418.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d87618dffb---1994280095.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607622b6f4050---vejadi.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/59198521648.pdfIn PDF document text
    • http://teaandtiarasmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/30156840710.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/jclrvqpmojtnaddmon0vpqqtl8/gilofu.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/0af7cd9edcfd9902c25bd7563dcac416/88077970024.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/43534f70d12c70618546a50672561360/zenizejoruwuwelakenot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=flax+seeds+and+fibroidsPDF 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_off0000fb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11322 10468 bytes
SHA-256: 905fcbe1874ca578b9b33d11d0a2d421e0ddb33a1952b588f060a1ffb5c85082
font_02_sfnt_off00012af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF4 17688 bytes
SHA-256: 88bf73fb571f5dfc14e7a543b38e631ea7cc77c7b9623cbd024fd8b64a48ebc1

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