Malicious PDF — malware analysis report

Static analysis result for SHA-256 debf10a0e71854e6…

MALICIOUS

PDF

71.5 KB Created: 2021-09-03 05:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d6cdec25378415c04e52b4f716f3d713 SHA-1: 16033dbe7da7197133f43a3f696024b2dfe4bbff SHA-256: debf10a0e71854e6b3b078f0ebe0320f9fc2f264eee5cbd172f2f50b51439013
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, likely intended to redirect users to phishing or malware distribution pages. The PDF structure itself is indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://irlanc.ru/uplcv?utm_term=public+finance+book+by+lekhi+pdf PDF link annotation
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/eeef0bb6587ebbc6e2c299a93eae544c/60017314929.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/kurujimifedurenirezi.pdfIn PDF document text
    • http://www.toptehnik.si/images/fifulabalapikoj.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/jijafufike.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081aea741635---60353541561.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/30166242397.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/bf9325b0d2b05cb83f22e808cb20283c/52832552098.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf5d299987---lofutaxadufoz.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/22254964680.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/xogov.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/f077bb37e0234fc2309f922a7b987696/80794225037.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/8103755deeca8b2832d97503501cbca9/88670288261.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/64749977403.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607398a99b014---99841388493.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/78036302393.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c522f523b1a---64986444687.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/redaragokodevevo.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161148ac430c33---gikasazenujobepakidotomow.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/mivegepesamutid.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/v8dt4n3vc9l88o9lt4ajm7ge85/fujejalixubomik.pdfIn PDF document text
    • http://ahchala.com/img/file/wabinofamojovo.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210602/210602183802392028ttcx0pk29jac.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_off0000b568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB568 16184 bytes
SHA-256: 5d243a6495150b3251a0dc089eec401f9df4bf07bd4aa3309874565d6071ee62
font_01_sfnt_off0000df79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF79 10800 bytes
SHA-256: ce4f94b23de7ce88fbd00f6e80dc7c4264bf8f1ea0f4174a32fa52695cc6b265
font_02_sfnt_off0000f80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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