Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f2becf001c3ea3e…

MALICIOUS

PDF

83.5 KB Created: 2021-09-04 21:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8ec55ba373bd41ecc6953665c13356a1 SHA-1: 55c84c7e930d96d0b491e9ffa90be3c802682886 SHA-256: 6f2becf001c3ea3e7700a36a4a579c105635ae77a2207b1d4fa271457b9578a1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other potentially malicious domains. The primary purpose appears to be directing users to external, untrusted resources, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://auf.vn/wp-content/plugins/super-forms/uploads/php/files/pbtgeridnicpue8menjo975tt3/19700152844.pdf In PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3938c8e9a---rileno.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/25937827572.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/91243740601.pdfIn PDF document text
    • http://yanartextil.com/firma/files/61752439859.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9da997a845---renavovaxojixewuvapabuf.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/02ridqc7jm15fanf79h4fhhma2/57847066087.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/31029131579.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/75248561622.pdfIn PDF document text
    • https://badoza.net/userfiles/file/butunebuda.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/40079697481.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2716d1341---zirupigevokapufunelanu.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecd39797265---pigivivomurenuropil.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/mugepibomadubafevemis.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/fafapisagagutigufes.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202108111433529631.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b121aede15---33817219213.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ef58551f4---71077818848.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160705d033397b---84646456492.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc99643aa2---lojurigemaxebelakaj.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/co4qr34e96ll9olnajaqvmvt77/giwerosod.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/33258711734.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/6e8757a151623f82d482d851137cdff5/teratutamekinimi.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/64855436859.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3d6a05198---41721976647.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=nmos+transistor+pdfPDF 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_off0000e4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E4 10460 bytes
SHA-256: 01e46981702e8bd1763cd988c0eb34209c4a21f51053266869f74b921979b3a5
font_01_sfnt_off0000fc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC92 16840 bytes
SHA-256: d1e6e4a03442cd375776911e17f09b3a9b46add62a3da2d1105c47589c328873
font_02_sfnt_off0001283d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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