Malicious PDF — malware analysis report

Static analysis result for SHA-256 f12848ca6336112d…

MALICIOUS

PDF

90.1 KB Created: 2021-08-09 00:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4f9b9cc3e436e5b788b7fed47c054953 SHA-1: 4b43d5a06d0a2c27c9c7f6a34dbac277a9f93543 SHA-256: f12848ca6336112d759944f40bdca05295f09ddcda31b5ffcb53f6af0f8b8af7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the 'link farm' heuristics indicate an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://garglob.ru/uplcv?utm_term=is+missguided+true+to+size PDF link annotation
    • http://cyklo-sport-servis.cz/UserFiles/File/bejegirudozagawijiteruso.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/duxekezofiluketotidi.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/22528888ed2478b93e0622ed47870b86/23538351789.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/6da98fc5855be54da4e0427f3b71b981/62562393722.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/buzofoxodibatude.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611048470892a---82420292824.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/lupokuwivekikujavimuduj.pdfIn PDF document text
    • http://standdominica.org/files/files/53681444167.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/difuxijerovibax.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/jozabigolokirezawum.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/dawidulerur.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/sipofapeborol.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089043a032bd---60725926838.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ccf22bcfd---xujusubarubiratamubevaj.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608058e42c723---26396297065.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/6147e358397e3f1ca2b8ec17eb704334/84674824646.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f92a55bd26b---sarofu.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/tobosazitimewalemisetaxi.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/26728093432.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/96735204610.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/4ce69ef136f36baa941703e3a66c1732/xixuwunofuvipod.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/87410987443.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/50726017567.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/tekosikusesikorudutaxo.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_off0000fa84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA84 10392 bytes
SHA-256: 08bc19a112fed92934671cb2e67315a696865014e79116036efd50bd6e9a31e0
font_01_sfnt_off000111dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EF 18216 bytes
SHA-256: f42fdbb24ee52e31233960df5650fcd83e2c3f2c00688b733a5a1e4e3138123d