Malicious PDF — malware analysis report

Static analysis result for SHA-256 421225de819d1ab2…

MALICIOUS

PDF

89.0 KB Created: 2021-09-02 09:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5f2a942edc38084dcca7f3397a4b4bd SHA-1: 3ab8cd58de5e5f28a88d5f83d35c91fe71506320 SHA-256: 421225de819d1ab24742b01b5337b2b72e95a3e6c2e51705e44a0c2ccba83727
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it contains a link farm pointing to compromised CMS upload storage, suggesting it's used to distribute malicious content or redirect users to phishing sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/oj8idpc81m8n8617m3sckidp4o/46122938257.pdf
    • http://reicar.dk/userfiles/file/42151524557.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/621bfhpetj9gfjkbtit5joirh0/57008413892.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608685b4af660---40000580472.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d13125ff1---xulipelutipive.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a290e50c12b---ferekotikitonujejofudut.pdf
    • https://northwestconvention.cz/data/files/53233729289.pdf
    • http://liweisteel.co.th/ckfinder/userfiles/files/modigurijibaxafuw.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d298dc262---8076679669.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c68ddf1e8---33649733019.pdf
    • https://arerp.kr/data/file///22948162983.pdf
    • http://spreewaldatelier.de/img/editor/file/ladatomejiral.pdf
    • http://csc0535.com/userfiles/file/20210623104504_hhope3.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/0ieg01h8dch7ti9goq73qsgqa8/9241334955.pdf
    • http://nc-israel.ru/upload/files/tavevabizavebitezonuwi.pdf
    • http://cleangroupbd.com/ck/upload/files/gubuwazixexemeti.pdf
    • https://emmaushuis.org/pages/rizig.pdf
    • http://wittzumstegfamilyreunion.com/clients/e/e5/e56c03c63d8c9260b12fda9e5e6a3df6/File/forabimufoluborutiwozo.pdf
    • http://change4best.ru/upload/file/sosomodukarejeta.pdf
    • http://cafegreenwichvillage.com/uploads/files/45301372102.pdf
    • https://dm288.rs/slicice/file/biwuduwovuzufadepadope.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/6albas5f88jhvg786m4k4cien2/detuduradojafarasor.pdf
    • http://oreoltour.ru/sites/default/files/file/mowirozufonavozopebirako.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa135eec29---35570336789.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=lifting+weights+with+ulnar+nerve+entrapment
    • 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_off0000f43d.bin
069ac2bbe277c42f8f8f7f0eecfbad9c44cea2f3d6319cf7d5d23873a2119b07
pdf-font-stream PDF embedded font (sfnt) at offset 0xF43D 18168 bytes
font_01_sfnt_off000123b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x123B0 16792 bytes
font_02_sfnt_off00013bc7.bin
0ee5be82f982a82d4e727d31ff361797a755d5a1f6ffd254682bed8b3b2b9c37
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC7 10892 bytes