Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd44ed315c674fc3…

MALICIOUS

PDF

84.7 KB Created: 2021-07-01 23:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b68737fdfb006aef2e0fcf0f9830f73 SHA-1: e4a537254ac670c9edcba70b88c14f27ccd354bc SHA-256: bd44ed315c674fc38676bf3c261e5c3e4d7aa686b8312ec1f58e60bd7ca4ef29
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload directories. The document body is heavily obfuscated and contains no readable content, suggesting its primary purpose is to host these malicious 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://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077009fcbddc---58155995894.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/9f3a2600e6d3a9a16583dec039c4e65c/40249998985.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/22e13a659e343fedc10743054c409ba8/nururorenaj.pdf
    • http://aliceinformaticasrl.com/user/pages/8389345570.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a05374dca16910ad202ae5385fe9b974/pazazotigurazuxo.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608633e54bfdd---xokej.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/08b00d8791ab3833a072933e5e20dd35/gurumatelexefosifabakuzin.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a70aa87f3fc---jeborulilewugu.pdf
    • http://esoftland.com/userfiles/file/73642810601.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081885c07755---98801598389.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d01e814e455---9491094090.pdf
    • http://worldprint.su/userfiles/file/koxunevupafugegiwu.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/engbrqsqb0udh8vrbq4moedjrl/katasade.pdf
    • https://pabrikangka.com/contents//files/41800523554.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608544c31991d---85527856613.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607870591e488---jonebudabuz.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/fkq613lq406dav78u2h4usoqbo/rewavebomagapegire.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/9270088981415bd946b02b98a5b61d21/vinefolejimaxujenofaxa.pdf
    • https://babamore.com/upload/ckfinder_temp/files/20210620095632.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072e0f59abb8---62110369590.pdf
    • https://seerupit.dk/assens/file/47174937844.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/86323a587be69b5ad60ae4390a2bfde6/tedomujo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=chicago+manual+of+style+notes+and+bibliography
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CC 16792 bytes
font_01_sfnt_off0000ffde.bin
60a93fef006fecfa20a8a76917bfe05c8a529dc0e550d92582e80dafbdc03c50
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDE 16588 bytes
font_02_sfnt_off00012adf.bin
26dabd30b8b2e5eb9fcc1912796e35ec643b3a34dd3491cd338685878caae59c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADF 11452 bytes