Malicious PDF — malware analysis report

Static analysis result for SHA-256 e220cc7b81d288b5…

MALICIOUS

PDF

89.9 KB Created: 2021-08-12 20:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e8db1443eff02292cbd37fec31bb0e1 SHA-1: abd508877720646b14fdfa18639d3809af42bff0 SHA-256: e220cc7b81d288b51bc8a5a22d702ba9c209c5d2b79bc7d0f1a1bf9baafe5bdd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristics identified the document as a link farm pointing to multiple compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the presence of numerous external links indicates a primary function of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/hl6l4alt38uolstvfn5ao89vl4/42151965443.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a7813275a6f---73189083686.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160da94bef2727---kapupiruruxudevu.pdf
    • http://thinhhoanggia.vn/Images_upload/files/gegoxipunoxibavuzaxuneko.pdf
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11043724313.pdf
    • http://marinapogon.pl/upload/file/98613168343.pdf
    • http://skogsformedling.se/bilder_umeny/File/12966443571.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e8b2e2cb2---mitego.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102a4e77e258---kagig.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f352f011---25083240169.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6cf559704---85686831187.pdf
    • http://nirmalapublicschoolerumely.com/userfiles/file/8681929893.pdf
    • http://pamatudarbai.lt/ckfinder/userfiles/files/65273672594.pdf
    • http://tdsns.ru/userfiles/file/98325256316.pdf
    • http://sochi-riba.ru/ckfinder/userfiles/files/taran.pdf
    • https://sanipacific.com/attachment/file/19146787283.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161057f1b6d0a9---77348666597.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/5efd70a1aa183a7da656d5456b6dc157/laveseburulelitipamewusaf.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d43041149b5---rikijuzomax.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/8sfmbhbplc23opuvg5cq4uop9u/52144490471.pdf
    • https://red-adlay.com/upload/files/nowivobap.pdf
    • http://wijnhuis-vaessen.nl/site/data/ws/files/91535268279.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/69b65c3dee3bb4f28eab5e8483d9c39c/94377357686.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=eminem+rap+god+lyrics+fast+part+how+many+words
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e185.bin
1f8e2b869d4126cfde6da3e3d508ce8b84bd231a8736b83ff615a08001423faf
pdf-font-stream PDF embedded font (sfnt) at offset 0xE185 11248 bytes
font_01_sfnt_off0000fb7e.bin
0bd1b31097a2cbc3aa7ed04259ea10f25f27ad9e51c6b37a196c47409ffb0549
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7E 17984 bytes
font_02_sfnt_off00012aac.bin
66b7945b99a9c78025a9a0ace4161995b24b08b80ea391fd428eddc3553bac27
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAC 16544 bytes
font_03_sfnt_off0001416f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1416F 16792 bytes