Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b141403a201fef5…

MALICIOUS

PDF

80.3 KB Created: 2021-07-08 06:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e16fa4db1dc3179b7d73b3fc4672222c SHA-1: 6794c067e5228e80f2fd0ab7fe4a4b4b5826f7bd SHA-256: 0b141403a201fef5683788b5f269dfec83ef4343972bf7e7c5408866f0966b4d
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm or SEO poisoning tactic. The primary function appears to be directing users to potentially malicious external sites, possibly for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://albino-pitti.com/pub_img/file/82411564458.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b355747d00a---lurijujubajulukajolirego.pdf
    • http://sea-cruise.ru/ckfinder/userfiles/files/nopej.pdf
    • https://auto-rujo.com/images-editor/file/nerolavubipevetesa.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160e65140aabe4---fiverenakavawawobede.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/dabepod.pdf
    • https://taevlingar.se/images/pages/file/posemokexabotal.pdf
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/vunekinu.pdf
    • http://shhs69reunions.com/clients/e/e9/e92da0bc0099326815942f81a5c18dfc/File/fejunobuwexow.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608684153e12d---wugerovugudadowitaxex.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a850aab6755---8061669817.pdf
    • http://aplus.to/userfiles/file/bigubizeva.pdf
    • https://alexandrapanayotou.com/web/images/static/file/pefegedusonixe.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bff31a07691---jonare.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609898a3ea924---7859229120.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e39bdada9fc---8703587693.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/raa8f06epl7ep60irjp09f6dd0/94382520475.pdf
    • https://armagedonspedycja.pl/files/file/jilukelemiluzifukoguve.pdf
    • https://aslimitada.com/userfiles/file/82954632894.pdf
    • https://hogies.com/includes/template/uploads/file/85696524998.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942e4ed9483---jofufiwekiludagodatugemed.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/rq0mdd5ea42f3j5v662rehvi4s/kevodon.pdf
    • http://waterreducer.cn/d/files/5243355940.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=directions+to+downtown+san+antonio
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6b1.bin
c479540f9a0bad07ddea31a5655519ae7e6137ef46a986e600b752524879c34a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B1 10404 bytes
font_01_sfnt_off0000ee76.bin
fe1296a28a2c127c4fdc81f217c5b0f43c099472a1e36455a17b67608c39d399
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE76 17416 bytes
font_02_sfnt_off00011c15.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C15 16792 bytes