Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf343c639ecfe3d…

MALICIOUS

PDF

84.0 KB Created: 2021-06-27 00:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b17d9dbc0430ec5b15eec682d4eec69 SHA-1: 84bec90e02d216389b2146d1a6e022e229483c87 SHA-256: 5cf343c639ecfe3d0d10c0dc4cdb9ffd08c6376be96bc629026042b5b691104e
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 many URLs pointing to compromised CMS uploads or disposable hosting domains. The PDF structure and numerous external links suggest it's designed to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77303225327.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607714185558d---99351862476.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b34ee7cd308---xozatotik.pdf
    • http://halmar.info/userfiles/file/punid.pdf
    • http://olgapolyakova.com/files/files/letefej.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9471eb43e---42531016117.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16086f11121cb1---54671404319.pdf
    • http://cuacuondaiphuc.com/upload/files/sutabiraximidopodixabil.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160be262fec169---ludagepisow.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/f98055e8ea1f57c3557405c1abda3e34/mutoguzogunusatawopurufu.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/4e9e1a625de9a6f7b104ca92514c0fb3/9600088462.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/r1o9t88u5mu8kra52v0g77kko5/59161168766.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e8cac243ed61854c40e78d79608e57cf/83755908744.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0c1bde61b---wabezesiwokubepebuxiv.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/d1ec59ba9951f09bcc0b1427a57e0af4/87287003944.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/68f4153a6f949611ecdedb5f1b326e0a/vojotozajewusepagagiwaxu.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160810cf574024---zonijovenevik.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160778a89765de---zitebawoj.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160acd67500e77---xikopeboto.pdf
    • http://lumieretvie.com/userfiles/file/44272956023.pdf
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/tuwufibemavino.pdf
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/zoromilogugokewufajugupa.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/7bldfir298r1uvluma96b5ip2c/vuwezakefep.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=conjure+up+meaning+in+english
    • 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_off0000de92.bin
83c38589f95f2252bc4e9de44cfa5da3870fc2876c1c53e4f3c9a98b441493f0
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE92 19140 bytes
font_01_sfnt_off00011013.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11013 16792 bytes
font_02_sfnt_off0001282a.bin
1b3d1ea1a580637c0b0c912fcc3d47a31d381200cf4fbb32a3e597da1cad6041
pdf-font-stream PDF embedded font (sfnt) at offset 0x1282A 10860 bytes