Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8b399ab5e10ece…

MALICIOUS

PDF

69.7 KB Created: 2021-06-09 17:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f1b32c569a5a83f7a90daf4582fe26ef SHA-1: 0c6c540ca1e5ca198eaf65c5ec6e2b7f4087f254 SHA-256: 7a8b399ab5e10ececbf64f9c40b84227a6e3f381f6178a3cd789b9c3ae0f02b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is identified as malicious by ClamAV and an ML classifier. It functions as a link farm, presenting numerous URLs that point to compromised websites and disposable hosting, likely to obscure the true destination. The embedded content suggests a lure to download an APK, indicated by the URL parameter 'download+igi+apk'. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://allytemp.ru/uplcv?utm_term=download+igi+apk PDF link annotation
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/001c69ecff2880f67fad5551ffbbe66b/14639960160.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0cd63d205---bivaxoxozanuk.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/720246f82bce2bcbdca14126d3d3fc1c/87590623882.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/padafuzojut.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c0b886a68d1b38f1fea8108f472f7492/14346261257.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/90441124770.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/19286532586.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0obc8fjf1o432acl8ra2qidvb3/lejuke.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/25954986511.pdfIn PDF document text
    • https://lemanssrl.it/file/zosonifuzaluk.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/3b5dc80874f1e93db84155cbbe3d8256/84299717581.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/c67d50c8c70e3771fdab88295f834a64/kekupogiremim.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/zaxasa.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608214582f566---tujabuxabupapapizadulonen.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/kkg9b71hp77t1064b96oc368m4/93465257797.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F9 5008 bytes
SHA-256: eb7c8b80fc6ea5913cb7fc562f01558a2e9677b37dd2c0f49e56cb6749b6bc41
font_01_sfnt_off0000e737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE737 10276 bytes
SHA-256: d0a6d06a46b9d5f81bfc4d685c508e6dceac41ca22f67b8e364b9aeb9f249e45