Malicious PDF — malware analysis report

Static analysis result for SHA-256 661485b6dde291ee…

MALICIOUS

PDF

88.5 KB Created: 2021-07-25 16:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bf0416fc95ee72f20527e038f9669b31 SHA-1: 4240425a40ce4191bcb2a4e5f7e4491698107443 SHA-256: 661485b6dde291ee321112cd63177e06ce8dd9b0e02650b3daf6c3c087edc2d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ClamAV and an ML classifier. Static analysis revealed it functions as a link farm, containing numerous external URIs. Several of these URIs point to files hosted on compromised WordPress uploads or disposable domains, indicating a likely phishing or malware distribution scheme. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://minipit.com/data/files/51477478908.pdf In PDF document text
    • http://kaies.net/upfiles/file/37923666370.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/0a70c7192d3c2a516d5adabb3ad8a678/mafagi.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/dadifugajav.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/femavavibaxeludeduludi.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/didizenuke.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/degodurunulibogijexunovo.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/47126652884.pdfIn PDF document text
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/29870505921.pdfIn PDF document text
    • https://banghenails.com/upload/file/76939100331.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/73183071034.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7aae432341---96326851607.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/73107020430.pdfIn PDF document text
    • http://ipceurope.com/assets/file/vufopoguwajuzawati.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/tozevixuwosi.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/xasuwaxorubivewivotivoje.pdfIn PDF document text
    • http://jp-photo.cz/soubory/files/wolagumijixutef.pdfIn PDF document text
    • http://bakoca.hu/files/file/70702070304.pdfIn PDF document text
    • http://arnold-sitter.com/CKEdit/upload/files/43702680776.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/77334984975.pdfIn PDF document text
    • http://remobudostol.pl/pliki/59138604835.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607aefce2a632---vaxuluk.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/010950323324.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3eda0070d7---jomutasotawafovabit.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/70913982908.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a270a5859---fonezedotar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ventajas+y+desventajas+de+las+redes+neuronales+antag%C3%B3nicasPDF 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_off0000f1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A7 11064 bytes
SHA-256: 6a4cd7f8ea08da83c5fbefca0e02933015ad6b2c55a987a11c4b47cc73b6d602
font_01_sfnt_off00010b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1C 17700 bytes
SHA-256: 93cb0b162b435f35e130eb60178e29c5788cfc7118c7046aa2c92d0729d37141
font_02_sfnt_off00013828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13828 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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