Malicious PDF — malware analysis report

Static analysis result for SHA-256 45ea19e414d6c515…

MALICIOUS

PDF

95.5 KB Created: 2021-07-31 07:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7e7e38fc124cd06863cc8cbe68cc1469 SHA-1: b87626ceccb24464b953a61cee2e2b08671d6030 SHA-256: 45ea19e414d6c5151ed370be35486040df163499d576f209eed67ca182313210
164 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm or SEO poisoning tactic. The presence of a 'download button' heuristic further supports a lure-based attack. While no scripts were explicitly extracted, the nature of the links and the detection suggest it likely attempts to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://hayatteknoloji.com/webimage/file/wurinexugubemogatovatuga.pdf In PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610384d28b71d---navirafomudapopemiduluwo.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/8410327116.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/52944528069.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/6543362031.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ddba74468---nazumabavafom.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/asp8vft9fuooee7cm9o92qfte5/patuvijifito.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/jupirodared.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/gosegowod.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/fosewaxurusupu.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/m3ipho1nqmk4lvs8tvmt8qq5pj/rezefavokelaxiruzopo.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/77382e1af49f56a24141bd982044127a/nikekijopenuz.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1be558b3f---revurizetajemifamiteban.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/78966840875.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e3a560ecfeb---kenazovudipixuropo.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607527f34837d---tudakoxuwigadotugu.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/5ail0ug4fob4ihe0fa3ool2q74/69556435407.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/487c5ebcd58bd35503b605ac37fe5f3f/tuvosujozikigixojatevuru.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/64058379291.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160725f1883066---sifonekuvipaz.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/57429720690.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/sp7nl092oqjveql1guobkbqnds/xufitorad.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/815f10bddef1a1b714768f9b7a100869/80849054736.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607997ab348f0---jijuvima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=program+de+convertire+pdf+in+word+gratisPDF link annotation
    • 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_off000110b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B9 17764 bytes
SHA-256: 273281bec1f37cd90b2aa9b97ac24308ea2280aecb659bd77a74e01a5de828c7
font_01_sfnt_off00013df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF7 11068 bytes
SHA-256: 5551956661dfccac43c5e722ccd29e4d9749f6e7aa52350595eca219440e9204
font_02_sfnt_off000157a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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