Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b949de9fb7ec22…

MALICIOUS

PDF

78.7 KB Created: 2021-09-20 12:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d367fa6f82755280bc6223264b7775c3 SHA-1: 34dff3bdd5df4d2b792dca10848510c82291fb17 SHA-256: a2b949de9fb7ec22450144eacc221451a0140e37340137d7e5b488e588d37770
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a phishing or malware distribution intent. It contains numerous external links, many pointing to compromised CMS upload storage, suggesting it's part of a link farm designed to redirect users to malicious sites. No scripts were extracted, but the PDF structure and external links strongly suggest a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://irlanc.ru/uplcv?utm_term=turbo+free+vpn+download PDF link annotation
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2fde25c9c---90889090239.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16141bb0197d53---4581955161.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16144c1d7d1206---gofoluwisan.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/18537519782.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/deparuvevezowolu.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/64500551306.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/44424000114.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/nipeluvakesa.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/kilonozaviniwipexewizo.pdfIn PDF document text
    • http://chamdure.com/DATA/files/23357123649.pdfIn PDF document text
    • https://photojet.net/userfiles/file/fifejuwusafirenave.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/negujajeretugatiridaku.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/xigijesulafodajufuzazu.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/91165146594.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/90688939193.pdfIn PDF document text
    • https://scalper.ir/data/files/file/2768242659.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/pupavik.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/84247926632.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614148d27a736---1934083349.pdfIn PDF document text
    • http://ellev.fr/upload/files/xegut.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/62994056072.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD103 17608 bytes
SHA-256: af0a67efd263ca7444e9d329caa66504521a3984e8b29edeba28100d2650644b
font_01_sfnt_off0000fdf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001160b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160B 10488 bytes
SHA-256: 036dd82778f19b81c8633701bbfa7e05c9ce670c6327cd10b97690bfc858a191