Malicious PDF — malware analysis report

Static analysis result for SHA-256 17a3885e27a8b912…

MALICIOUS

PDF

75.0 KB Created: 2021-08-28 05:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8b567ecf99729f4b873813adca144090 SHA-1: cc341c0e72536ae9949b5bb771ec3a2fab72dd46 SHA-256: 17a3885e27a8b9125c17bf242fa6b73037b362e923e1d72f221b29d9fed166bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics suggest it's designed to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://weiken-rc.com/upload/files/91218949010.pdf In PDF document text
    • https://tusenfotingen.nu/anvandarbilder/108/files/79801559149.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/pvcthhgmcqoreecu7uuh3912h7/jafabepasonave.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/u9cqa4f1129ugg2fct65iq18ec/99778600132.pdfIn PDF document text
    • https://europartner2.pl/uploads/17245848602.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/64829691412.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-6/20210606154612810874.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/68805827268.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/c1baccbb1b8e2eda98733fd44b32f741/14220862787.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/6fda5ab3de7a80720432175ba09ae8be/70154695412.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/mfl8lvthr2t5id243j2iht8is2/sasuxuma.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/68998789355.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/995uaa52al597n9ohltnlefr07/bijikagotuluvapetikef.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe8fee909c---xiniji.pdfIn PDF document text
    • http://congluc.com/upload/files/8486528292.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/41890537176.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/kerijovebofitali.pdfIn PDF document text
    • http://tano-cable.com/d/files/85871688800.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/k0mcmc5cu8otaqes6ojvtaltjs/90864000880.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5a5245c12---kerelotozuve.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/151fe5e4fc9c2c0d9772019ed7032e07/29106808900.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/d99a4e083034d97942b24c4e8cc77787/8064178390.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/pu7ov0fvn2hm92a572dlcu4lvi/bumoruxuzejuzulosugix.pdfIn PDF document text
    • https://puppometalli.eu/file/wezevejomisil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=tertiary+comparison+guide+reading+answersPDF 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_off0000c18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A4 11072 bytes
SHA-256: bbd34011d16a99456d0f2f6d8772ff4a00335949e3f6f6f100b4061f3368c52c
font_02_sfnt_off0000f35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35A 16848 bytes
SHA-256: 1e93dde9681e0274164cdddaabb840e41adbfd05bb0f4487bd9ac07f2ce8bea3