Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bec88e9d75391e8…

MALICIOUS

PDF

75.4 KB Created: 2021-07-22 02:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1fc97901157a4f1555011587cce3d3bf SHA-1: 4436c2a3dd70fd71c84dc2cdf827f573e881b994 SHA-256: 8bec88e9d75391e803ebc01b9add63f02d2cf83b939ebbb8cf395ee56dafef59
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to disposable hosting or compromised CMS uploads, suggesting a phishing or malware distribution lure. The PDF structure itself does not contain readable content, but the embedded links are the primary indicators of its malicious function.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://aduanaldelvalle.com/userfiles/file/10476909449.pdf In PDF document text
    • http://modnyi-buket.ru/uploads/files/8221018863.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/29564765509.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ace4977a063---janixixazof.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/15980917852.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/c7bb167e145dbe38620252fdde0c31ff/26762084438.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/zukewemarimup.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/26844640753.pdfIn PDF document text
    • https://vestol.bg/files/file/pixuwilimavazigakewukova.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/85130984122.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/popanorebexenuru.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/85571319141.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/32721988089.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc5694e419---42242306584.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/ff8e16d4803afe1a5158186dc8ebc3b4/85620757156.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/49510746367.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/50b81735656bc4b643669fe0abb9ab2a/34268505077.pdfIn PDF document text
    • https://led7.ru/file/sesirotekajenipuduzulow.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc2b451d36---67202617822.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/bisesadofiwedila.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cfbb8afa9---8747024124.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/4ac63dea49bf580bf3ffde06486a9a55/dosikenewawo.pdfIn PDF document text
    • http://elitvorota.ru/f/file/27706821891.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/busir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+send+scanned+documents+from+notes+to+emailPDF 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_off0000c612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC612 15368 bytes
SHA-256: 7d586f2ab64fcbde032686d3750a50672d1116c13d9f61d9ee09a0ff2938cfa2
font_01_sfnt_off0000ed81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED81 10816 bytes
SHA-256: 64a2773f9b44d7a61e3c4d510c5a0cb016a08d995bc90940f6a58a082e6a11d2
font_02_sfnt_off00010670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10670 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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