Malicious PDF — malware analysis report

Static analysis result for SHA-256 042ab007c69e5f7c…

MALICIOUS

PDF

82.9 KB Created: 2021-08-26 06:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d3ca1ebca4d9dd5537535bd718462474 SHA-1: 3bbd4def09224fe5976476c84140467eda66b314 SHA-256: 042ab007c69e5f7c35251bda4b510ed4325db6a385a8ba60d996d78f2191d4df
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=fundamental+of+electric+circuits+6th+edition+solution+pdf PDF link annotation
    • https://wisestudentz.com/userfiles/file/41342534432.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/43672856529.pdfIn PDF document text
    • http://poiskvod.ru/images/file/nefozovusovufipoboxigut.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/tetedavelolawadigidotut.pdfIn PDF document text
    • http://vswet.ru/f/tiwenobesinotiwalado.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/85225609660.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/54781624735.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610dfa384f0a3---51341149472.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/33937763007.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/jamotibupad.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/napetumedezepaxezidivoneg.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160ad04a1c321f---88397124521.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16070a9af4b9c2---80595718496.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/rezawajuzifodoxoragixu.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/wufidevuzizegon.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/losefirutikojarore.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/8387bea11fe35b3ea11a388c1fdeb823/83880576029.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/57031404885.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/b55a96ddc06481b47d189f9ed1a01b00/watiwatodaxunesiredi.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/32924337174.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/vupalodakafugaxaxotuta.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b94bccb19---29871018459.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/92f03e60f5b6ada5334e35e860bba32b/ladevebeputigivosez.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/953784717.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_off0000dd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55A 17300 bytes
SHA-256: 2d6d70f3d923d97a5d34c710969a16b796a516f75a9f3edd2ca8970a81ddbf84
font_02_sfnt_off00012260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12260 11132 bytes
SHA-256: 02b7efb3e2705da1c2b6bf3357eb4cf01cac0bf2df8eac0df9b8fd12a1ae3c98

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