Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b2ad645d64d1f6a…

MALICIOUS

PDF

112.5 KB Created: 2021-08-26 02:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e56b00d06406ecc351567d2a5667076c SHA-1: 0a75720f5614b0893694786f094dc23f9b80ee03 SHA-256: 9b2ad645d64d1f6ac2dca687add6ca444d8c81d7f99eae9cd98322e96dbaaefe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS upload directories or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://wastran.ru/uplcv?utm_term=different+types+of+armadillos PDF link annotation
    • http://studioturina.com/userfiles/files/labero.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/13865817936.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/gojapunededejifofeg.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1606f19f72f0f7---24989891000.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b0144a81204---75549211875.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/23687547612.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/takoji.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f88e50700f---kutezodafatumap.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/diwexuvaxir.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/f18afd156a4ce95937cdb93bbd7eb029/34613073057.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/17257764393.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/dazalelimiloxajewezinap.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/6203fab2ef1fa53a8d7c006bf23e1de6/xakojokoresogupit.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4dd79fee3---mugotovajag.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa9bfe53e7---pepidajod.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/bobivigixipenafupedudak.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/33964229617.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/wewamas.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/mepusomalitag.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/c5glgplpf1e6douu3c97lfiqv0/14702105648.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/nepisimabapow.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_off0001567a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1567A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E8C 17316 bytes
SHA-256: 0ee2b6e41f46c9993e1b91a8e3a99c4fdf173cd27ecc8945f5c8df26dc1ca68f
font_02_sfnt_off00019be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19BE2 10772 bytes
SHA-256: 3316acb3563a431e40e3918add7d44ef10556066ab85263435805f51f858a3f0

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