Malicious PDF — malware analysis report

Static analysis result for SHA-256 9411ae9b16c3fa0e…

MALICIOUS

PDF

97.5 KB Created: 2021-09-07 08:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2ded3259cc02a7f601f707f83c0622e4 SHA-1: 734226cc29d9735a65ef4a5a10e098b97cccd94b SHA-256: 9411ae9b16c3fa0ece75a679bdd67ec4164aaf4d6882e0d089abd2a60abbf9c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing or redirection lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

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 http://purofirstli.net/userfiles/file/xipaterowukusagunateko.pdf In PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b439236af7---xejedexunudo.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/tksi3uq2vh60mad1vq7h8lhf14/mapijemupozituxiwo.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/mbk5qimrmk2fejc6gj13e27oi9/letedajepubiva.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/nuwerokifela.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/e22c7ce98b21a3309170b53c6085cd6f/28914366210.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611e49fc0b2ee---ziwumilopatatos.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/91876001129.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/65718052428.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/op4269hg5agep34brh2ofk03f2/mugimamowezovanuw.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/31888185861.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/76154965937.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/4880242679.pdfIn PDF document text
    • https://cecprint.com/images/file/memonagoxosas.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/91721392959.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6ab52f5b8---89988865221.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611864d7050dd---kerowutelafa.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/87629099283.pdfIn PDF document text
    • https://isosklo.cz/uploads/didirinoxe.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/xonesavesuximazexo.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/duliduxinofotija.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/68139824350.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/jeguwomulapalogesogamo.pdfIn PDF document text
    • http://demkapi.com/resimler/files/74461629194.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/5fo6evvi9djvl37cq89b7e1kf5/kobalevenupusoju.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/embdqkotnepq1c676hj142m1ks/keripixadada.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/8a48a6faa3a3485b0a0eaf5970d057f0/23197745328.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=prime+time+2+student%27s+book+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_off000117e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E6 18072 bytes
SHA-256: ffdabb384871fcc0773753e0c9d0545a1e8d52b8b4e78b19137a66f92d9321e6
font_01_sfnt_off000146d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EEF 10936 bytes
SHA-256: c962e3e17ea5eb8ae9168091df647f0f464975c9f6f074e30bc3137713f73e76

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