Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b58a19a88d7d2a3…

MALICIOUS

PDF

73.7 KB Created: 2021-09-18 08:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a6361ae826ad12c60f26d738b274321a SHA-1: 0b070ab06769309dad7cdf6affa531e552af8cf0 SHA-256: 0b58a19a88d7d2a35dcbcdae0459278eb635be538ae4f23cbe606c556252e7e7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many of which appear to be part of a link farm designed to obscure the true destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of URLs like 'https://pistant.ru/uplcv?utm_term=obb+download+pubg+lite' suggest a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support the malicious nature of the file, indicating it is likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=obb+download+pubg+lite PDF link annotation
    • https://cambodiadriverservice.com/userfiles/file/58164031811.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4c953ab77---68231021691.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/15834693372.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/31787226964.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311f55703fe---zebolap.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/wumafo.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/90573749481.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/rotitafozixunuxonafaruwi.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/vuduwopevekuzalojavurig.pdfIn PDF document text
    • https://gdaniec.com/upload/files/gikinozosuwepeze.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/vimubezuluvibotimupodupiw.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/94188277982.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/61861924441.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/zefaxutesiwakifimiva.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/wapodosazinalofuroxuv.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133331fef691---81560738976.pdfIn PDF document text
    • https://subded.org/userfiles/file/71593280077.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/02/gomurubatikenog.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/leladube.pdfIn PDF document text
    • https://successalpha.team/upload/files/jozuwozejadap.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/xisosivefig.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/tapel.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16141a6b539569---bizusogiwaxawuderuratowu.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/mirugu.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_off0000bbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBCD 17440 bytes
SHA-256: 3700cbc649607819a0decb1e3c5a2c4e54eb813e2f2961d819e72e9c4c024475
font_01_sfnt_off0000e90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10123 10652 bytes
SHA-256: 18dfa3d391b785246e855c93cc3539ce3c691bdcedabe3a3d7510bf587a67599

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