Malicious PDF — malware analysis report

Static analysis result for SHA-256 555cb5e71fb3aacf…

MALICIOUS

PDF

81.5 KB Created: 2021-09-01 07:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d35771dad93172a93a45da91549f8381 SHA-1: f8eec2029ee2e34cbe90e9733e5e4a14f921cce3 SHA-256: 555cb5e71fb3aacff3e32d94aac8baafb896464ba9fcf63742f31bc4301d65c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 numerous links to external websites, many of which appear to be hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The primary attack pattern involves directing users to these external sites, likely to deliver further malicious content or harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://medvor.ru/uplcv?utm_term=extraction+of+sugar+from+sugarcane PDF link annotation
    • http://scamps.biz/userfiles/file/30700556861.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/65853436886.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/3044e2eb1e7a11c3675fa62605c7eba9/fexudimafe.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a82044ad83---fuwafuxaxigenuxok.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/nh49bjmksnu4tpenufokdmil42/87630298839.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/2f63d3a6a675619e2e4fef1288b26320/jafusaxapodafamavosed.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/ddcf0569b0ad7da7415ef5aedfd7ed76/lineduruzenevevo.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/gilij.pdfIn PDF document text
    • https://gulyaskantin.hu/uploads/frontend/files/vukolenuv.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160b65052cbdc7---42816287197.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/movosif.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/83916884196.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/7364431318.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/vofatekonab.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075124ee1670---joxewalidisofuvedogob.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/157eed27034face92e873b7275e74157/dubejeporafek.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/wibulonig.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/zaweweseko.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/84442314763.pdfIn PDF document text
    • https://birudongker.com/contents//files/vawevus.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/34041577603.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/de51ce6239a369405774becbf94d5918/87369081026.pdfIn PDF document text
    • https://securitydm.net/slicice/file/76277244553.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/gosorazarosudimelaf.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/29407740888.pdfIn PDF document text
    • https://csn-alliance.com/data/files/54163942491.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/bumokexuwo.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_off0000d6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BB 18476 bytes
SHA-256: e2f65ba6315e60f8d1539156979803c06dc1a25f1e912ced700ddd032fd75cf7
font_01_sfnt_off0001072b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F42 10816 bytes
SHA-256: 8c8f146d78b6da5e35b65b9c84ae79b39a659d63e6423c26ef9d44d335951147

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