Malicious PDF — malware analysis report

Static analysis result for SHA-256 397a6627d4965fee…

MALICIOUS

PDF

73.5 KB Created: 2021-09-11 21:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7c883795ac7d2ab4069687ae682c0c19 SHA-1: 56c5f0cc6162ae3634f4fede595613ecfceb1f9f SHA-256: 397a6627d4965fee08c364c728dd1d680bf7a8b37b97305cc5b6c9e34a23f97f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of link farms on disposable hosting, indicating a phishing or malware distribution attempt. The 'SE_CALLBACK_LURE' heuristic suggests a callback phishing or tech-support scam pattern. While no scripts were directly extracted, the presence of compromised CMS upload links and the ML classifier's high confidence score point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://laborke.ru/uplcv?utm_term=java+pdf+tutorial PDF link annotation
    • http://ckm-machinery.com/userfiles/files/2322564093.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/77721588866.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/45702911682.pdfIn PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/8722785313.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///54285397013.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/midelus.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/mizabepaj.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/43891277219.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/difixatepobedakatusa.pdfIn PDF document text
    • https://digireg.sk/upload/zigaratupi.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/telugapos.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff46f4d9fc---kalawabewilenajorerekob.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/25986567198.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/dizaxosaxob.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/jelirul.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///desubanukakesotu.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130d003719c8---38121349810.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/57212869280.pdfIn PDF document text
    • http://ccsl.asia/files/tigufuf.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/zaxudewisopupowak.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/kozepene.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/vusewenalipubaxexor.pdfIn PDF document text
    • https://istanajp.com/contents/files/jironakumezokin.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/5ut2k6fd5qklce36vku0bn7m30/xodemunidositutexaxobejir.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_off0000bdde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F0 17036 bytes
SHA-256: 783acc29c8eea6732e3409a1da541372bb60d8bf73fc78e576d5b4cf09f6c8e8
font_02_sfnt_off000101d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D7 10244 bytes
SHA-256: 2233e6753bc7bb3f61b1187838fccdeb901baf878a1fcb2252e11bb02812bd23

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