Malicious PDF — malware analysis report

Static analysis result for SHA-256 71fad7bcb0748a4c…

MALICIOUS

PDF

85.7 KB Created: 2021-06-29 02:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e43f17c337092abccf78df77614fea9d SHA-1: 50a8896f249971fbcd49fea4934057dc765f0f72 SHA-256: 71fad7bcb0748a4cdbd675708a7ce0eacd52a60b39eee620603378da23cdfcff
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://chcial.ru/uplcv?utm_term=hypoxia+and+anemia PDF link annotation
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/pnful9nk9d6m60ri739vjoecp4/38874111403.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/ce0556ffab5db805c26207fa2b919457/susedekatoguwoxuk.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/23026581631.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/7921b33592df02c021a189898f1e4cd6/lojapijufani.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/5of5eb93vvpqvip1qiln82ci94/9550459286.pdfIn PDF document text
    • http://ihvanturizm.com/rsm/files/letedoremowufezurug.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21b370382e---37069776757.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/rigovetegalolebox.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16083403eee74b---46880914898.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb720068b1e---7430997703.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b6b1467c7---dosalaponemilafaxugoki.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/wenojosalamelex.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/290092c20eb9c82d54421b75864c4df6/56628083417.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084430ea32e0---napipodetugujemal.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a7021b5f3---54122989815.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16076029125bbb---jopesoxanufonijoguku.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096589424737---10795995351.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e5fa3b990---75238948574.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a4383a86f02---17845088178.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/robanupajimujesonakote.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/sa4bj4ekjc99dghnp83ikl9ibp/15911278258.pdfIn PDF document text
    • https://zzhqhi.com/d/files/dixifedafusixafesa.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_off0000ebde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F5 10348 bytes
SHA-256: 609244ac94520a136cc1f87a14ed07f6718b536af04b39cdef75fd511013f6de
font_02_sfnt_off00011b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B34 17840 bytes
SHA-256: 6507d8874a27c08cc7c783628a19bb301f958e5a214e266579fb96936fa278ad

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