Malicious PDF — malware analysis report

Static analysis result for SHA-256 a48edcd3fd09d072…

MALICIOUS

PDF

89.9 KB Created: 2021-08-23 17:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: cee62fbc6f63f3d40714fa8f1d1b9ec2 SHA-1: 6214b4f7eba6b1045ac8e9c2d8511fd56b353ecb SHA-256: a48edcd3fd09d0722cdf4f12f74de5cecad2534394eea941b32b70b6b4dea4fa
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, but the presence of external URIs and the link farm heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://garglob.ru/uplcv?utm_term=how+to+rotate+text+in+nitro+pro PDF link annotation
    • http://sitoad.com/bbqjoekey/files/202107030511164289.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/b0a52592f4d51f8226aab36b52d9770c/80321101823.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/17d2ab3a0d2763ca4ac9f91decbf525d/41337530655.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed06ce881f---54097680922.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/7c47a843dc0ebc00f365c50f05434d9e/jenamojiberexokutegitajen.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160901111f268b---43190128244.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/xonakiragixawavokiweduran.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef38c5f2e6---pawajupadukibikezizup.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/tixozeferozise.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084127c3dbf6---tegatiko.pdfIn PDF document text
    • http://rainesclassof1980.com/clients/3/31/314d3ac3c31ee16cfc8f78d457af0ebc/File/rijofobatiri.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc90422256---87984642157.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/67634294015.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612043e5e359f---2877691221.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/66749438656.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/16576188827.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0541047b9---juxigepogarukumokomapivi.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081dbbe23da1---35536195455.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ed95ae91bfe9d3d6ce655c46349f8ca/menidewufakarofumax.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/xedagufaki.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/24276829123.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/gawoxusalutajo.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/22202092269.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e6c07d5c48c---matiferiwigoboloze.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/xatenugavexe.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_off0000ff0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11725 10208 bytes
SHA-256: 192ea107386bf67b16b31aae1f0c74b200e29e52d1bc78834017a2cd722ec521
font_02_sfnt_off00012e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E25 16576 bytes
SHA-256: 42a52fa782a7b0dddabe7bd1568da13d08291fc6db22de88a3a6c67c4e1b6c33

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