Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb054571e29db0ff…

MALICIOUS

PDF

100.1 KB Created: 2021-07-05 16:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 558cab9edaaaaccefcbd568f71b11208 SHA-1: 327050fc16c4bddeff0e8d6049fbb7f46fcfe195 SHA-256: bb054571e29db0ffb50a8ba3af63dab5b95f3591d1b2296178d03fedf8eb9978
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and other potentially malicious hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO poisoning or directing users to phishing sites. No scripts were extracted, and the document body was unreadable, but the link farm structure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/6ecd72a53d2841f1d0fe9b61f0b8c62c/16989291091.pdf
    • https://arerp.kr/data/file///84255225347.pdf
    • http://stpatricksreunion.com/clients/84553/File/jibawidavive.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c17047903---42657719132.pdf
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/c63e54be4f352467407c173381905db8/68709260319.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/xokubugudoleri.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b69843f086---datifo.pdf
    • https://noddy.nu/images/file/9321271436.pdf
    • http://j1medical.com/uploaded/file/91906092283.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b075be625e8---32721139454.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/6b57f76915d40ff7b2a51cc3a32ef161/96149550378.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/o63cipaepokn1a6f21i4rp4of0/wajowarizosafegumotabur.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bad38fc7b---xituk.pdf
    • http://chinoboxingclub.com/clients/36032/File/zizomam.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/t3m6bjo6mid6gff85vask5at33/8987233643.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075e1fdb348f---69026210440.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b24d978baee---29926597149.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ab64e51a854---65782130034.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608265aa65b6a---99464203518.pdf
    • http://vietsonplastic.com/uploads/userfiles/file/22638511729.pdf
    • http://pulsarvn.com/media/ftp/file/52865552746.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/aoum0ob00eia6o6fhei9vl64p9/24627161525.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdfb56767b---moxatogakamurapev.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/cd8d0659d0f61985aa4dea8082f75d91/wavugurupusezonodurek.pdf
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/tbsqgclc2d4lg8tnuj0modpmfm/wesajuga.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=describe+four+colligative+properties+of+solutions
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012220.bin
3456e1f0333a7c447cb461b983b8732bd9ae3ed87b8373159b6dd152d9553dc1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12220 10960 bytes
font_01_sfnt_off00013b8b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B8B 16792 bytes
font_02_sfnt_off0001539d.bin
6f1d8c10b95805dd116669e1ddf4c4ae295028603ed53dacaf16f913275a276f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1539D 17788 bytes