Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab98cb724fd46bf5…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 14:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 03f09120e0ea160b13430deb02d3a20c SHA-1: 68047d02b4f80b3dddd3cef795cddb923572533b SHA-256: ab98cb724fd46bf54e0ca939279a3d53e8fad1399249545f3b83a3e6851542c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on disposable hosting, often used for SEO poisoning or phishing lures. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the primary attack vector appears to be directing users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://huntic.ru/uplcv?utm_term=prosthesis+and+orthosis+pdf PDF link annotation
    • https://auto826.vnpec.xyz/uploads/files/46926702814.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/51266838407.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160f1e30c7f823---37056231337.pdfIn PDF document text
    • https://scapetime.net/images/website/user/files/sotoxikorumubexugeguso.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/i0v61g850p82rf2q0gmdecnqnr/87820927083.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d85e230c50---togiluk.pdfIn PDF document text
    • http://hanyuchina.com/upload/files/xavovisewifinix.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor///file/59877964432.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/97433265470.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/fce8f485441141baed7ddc99117a2270/17289637687.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/56031268777.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/wazenapulisisuxujina.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/104c78f75a9f15e7e0477d2830025766/delolabewuwuk.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/48486837884.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a6750b5b8---papaxatevisa.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/77427993473.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/74f8656534da7919aece03a7b312f2d6/24114670422.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/3231269041.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/nebobudepepowenak.pdfIn PDF document text
    • http://renknh.com/ckupload/files/2431362442.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/39437101792.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/mexapa.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/podifo.pdfIn PDF document text
    • http://al-farh-iq.com/upload/userfiles/file/rojasobodum.pdfIn PDF document text
    • http://caramelitos.sk/files/86344855078.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/fagatubugaximupir.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/s9ffd15va7gg4hlbl19573nlk4/zopuv.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB8 17352 bytes
SHA-256: d256891fcd919be81068d122d517760fe78590fea8d111e3f487b4f7d543d092
font_01_sfnt_off00010979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10979 10548 bytes
SHA-256: c8294bac64d620ceabfe1514961f229a758d6d84ac672356f70c32d02a5a5cc5
font_02_sfnt_off00012178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12178 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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