Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd7814137c9129f9…

MALICIOUS

PDF

81.5 KB Created: 2021-09-04 23:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 32a105288e8243a8801e78ecb8e8d9a4 SHA-1: fc0eb91b20da4d2e667ea030e806c9917c0134eb SHA-256: dd7814137c9129f9b5444c0120d3fff81b5e7a415d4f348534aff1774fc5becb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous links pointing to compromised WordPress upload directories, suggesting it is part of a phishing or malware distribution campaign. The presence of link farms on disposable hosting further indicates malicious intent. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948d6b884e0---jaxovibugaxume.pdf In PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/d13ecda13fc542584d6b3d40b851e8d3/gajezebudukebef.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/rilebuxiwulipaxafogepumor.pdfIn PDF document text
    • http://waelfawzy.com/userfiles/file/mojivopefuzusaxupira.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021052900512673499.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/409ni4cn2spfivmv0clpoo6um2/viwaviwavede.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/losuzugivalu.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/geriguvuputu.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/tufilagazo.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/5baqdi9iu1h3fhievdck8pkg1f/45426514974.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/613fd6e598a3c257f71324424987f956/53244457874.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/1fd09aadbba4cd5da4121dc3a40f1ca8/mikimasefelulesikugej.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/878f5328f0240497b94a66bd61dffc11/mawixufo.pdfIn PDF document text
    • http://lblussana.it/images/file/vabopamelisuv.pdfIn PDF document text
    • http://penetrat.ru/files/files/67004343016.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd78b80afb---35264636958.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0eb83f546---mepedus.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0d9bc12a6---60636148137.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086d14eb76d1---pubowuno.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/waxuguku.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/93767478370.pdfIn PDF document text
    • http://cmtsport.com/pliki/wejevejabuluxovifopun.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5c0576431---91316508629.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/010308555930.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=dissolution+of+first+constituent+assembly+of+pakistan+pdfPDF 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_off0000da80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA80 16692 bytes
SHA-256: d5d23b470b84bc7a0d2183bafb196f2a21cacbd1351e85c7420444a646a35494
font_01_sfnt_off000105a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A0 11228 bytes
SHA-256: ebf0ae6f877cddc78e31875189bf1d1d41f6dd3d15f527254c550a4b4345e7e6
font_02_sfnt_off00011fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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