Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ca34a3e4146071c…

MALICIOUS

PDF

98.8 KB Created: 2021-08-25 10:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 113f1368b8404e412be9c3f568e85e07 SHA-1: d8a27375023e9855b282282f3a7b974fe22334b9 SHA-256: 1ca34a3e4146071c10ec2c2679a5f17f14eab5bba1dee87b52579ac205676f28
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and malware detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.huntsvillepr.com/files/files/lifotejomotumuxol.pdf In PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/ad6nes3ce2ba0vp0p7dp0vsh64/8360463719.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/siruza.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/38391819031.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/5cf996ee66b243c604e558fbd3658454/gixutara.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/5940638375.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/32207767852.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/sijutofef.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/7830478083.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/49756152589.pdfIn PDF document text
    • https://digicpictures.com/downloads/nogefupidokawoveneso.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9604621118---bowegilakuxowof.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fb764d600---xobarukovanesemixizow.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/6e5bb2c8bc55d483e7ca11d1abc529b9/tasibevijavepamole.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021070119123273499.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bdf1a2316---67496936841.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/vezejawi.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/64tb23fjs7ohjbpe272dlkc1u2/lewiwu.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/fewidokumuwenopizer.pdfIn PDF document text
    • https://petala.gr/userfiles/file/96965294305.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f46d27c64---99738401264.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/71565349869.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/54721830398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=being+possessed+meaningPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77F 18736 bytes
SHA-256: 0dd6f8039fa6359fa9aa65a8b025a31cbc43f69f12b9518d040757754f768b3e
font_01_sfnt_off000116dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DD 16524 bytes
SHA-256: 0716a3215089d40554797c8574c43f8430d867757b36d56e1ecff7945c837118
font_02_sfnt_off00014a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A1D 10544 bytes
SHA-256: 0d262b7042d9b296055a9d035ce4e8ae52f3043e23e4ae7c88f01c9f63223fb0
font_03_sfnt_off000161e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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