Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfbf4c806337662e…

MALICIOUS

PDF

75.3 KB Created: 2021-08-06 23:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 517b99b92f6c1745d3aaa044a32c6de8 SHA-1: e638f71bf5565a5df4a0600ca5a744cc6fb595dd SHA-256: bfbf4c806337662eb6d4aa9887b3323dc4451c360258980c97b753a943ba4fbe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier with a high confidence score. It contains numerous external URIs and link farms pointing to potentially compromised websites, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics indicate it likely attempts to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=spider+man+google+docs+english PDF link annotation
    • http://amexeuro.com/an3_Uploads/file/3504161507.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/letotabufisuzajegiwodewi.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/54793593729.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/58863403799.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/a89feb8b25074dbf4ee0108a08cbe866/ririwu.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/fodutufop.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/63750537909.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/kekidutove.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/e8c0a83029cdce8aede04c8c08b20e37/45296143645.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160909d122f80b---kosoripomixivovu.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/59784798714.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160799e703a5ee---92439492560.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967f170bc54---zurozejisofip.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/2abf98a85c441c1b7a8849cb2dd269d5/94073202910.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/a3e829fead9894c03df53a35652e59fb/zarukamisiravefopajube.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/juderisefoxebosimagokaji.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/lifaxekuxekuf.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cede741a53b---lujedoxolo.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210708214458953.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/6653d4344daec8fd52693ecf54c74513/pofepenageranezu.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/gurijuripab.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e0cd05cb95e---88924202995.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/2151557731.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a01becc592e---73704548256.pdfIn PDF document text
    • https://memoservicesrl.it/file/tijiguzesoximejidujedi.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/gmgt5cd7gnkvn89037f7lvtap0/wejukiremojobinibat.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_off0000c3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3EB 10936 bytes
SHA-256: d19325aec6f5a373bbdba356b763f54eb222aa0ac176aa56067c8c2061538730
font_01_sfnt_off0000dcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB4 16216 bytes
SHA-256: 1369b28674cda8a40c5a3bc42c03e313ac0352001d6afaa84ffe4f8291bbeca0
font_02_sfnt_off000106dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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