Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3bb89a18c40ac4…

MALICIOUS

PDF

86.0 KB Created: 2021-07-08 15:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 29f23e4cc6d9019f05ee5f1ccf3fe115 SHA-1: 58e56b29924cbc7f0d976fa51e99a0b13ffa145d SHA-256: 8a3bb89a18c40ac403ed73d45ea0998918b244584b2e970cda376ea67138c3e1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it likely serves as a phishing or malware distribution lure. The file functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://hacoauto.vn/upload/files/rojawoker.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/d9225bc6c7c0ea2ed4ed58f5b01a475a/16739781390.pdf
    • https://motelandratecuci.ro/userfiles/file/76621710277.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160943968ad5c2---kulat.pdf
    • http://sushigonewildtogo.com/uploads/files/wonejexikaf.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/415432cb8e98764d692adb99293626f4/26901147872.pdf
    • http://stardentalcare.org/userfiles/file/titakojowidugi.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1643e5aaf2---xulitokezogeviwesopep.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/3d66399ede2c9cc392ba9d45b9750c9f/paramogapezuwura.pdf
    • http://4bx.pl/public/file/88057330292.pdf
    • http://restravel.ru/ckfinder/userfiles/files/36620352319.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/d16b07ba6631930b2f24d8dbb4b5fca3/kabamusogamegifiginupu.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fff4cb9b7---tivobaniwok.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/d21d4dcbf47311c575d492730cddb6cf/44140557382.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/261pordd60hme8ju863hel0lg9/90371106643.pdf
    • https://pasarantogelsatu.com/contents//files/tubetekekuretamu.pdf
    • https://confetti-seasons.ru/upload/files/bilaz.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/fd54aab8e44d0305cc70e580a4cee3b3/winasujumumuwo.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9dd3d82d65---radek.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/m7f138celpp7sdlsmkfci1d2f0/nevajexenoganokuxofadiw.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a551e293b7---gimefovo.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/r7ik68nk2b1e66ns5ab1e3kv61/12283905493.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+cat+in+the+hat+dr+seuss+pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e415.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE415 16792 bytes
font_01_sfnt_off0000fc27.bin
5b305a79c4182abd52fb053ca9dc9bdf80c5838d69701955c09723e155e438f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC27 17180 bytes
font_02_sfnt_off0001293c.bin
901556a4ecf208d0d61522ab37c5a1467969ce12b2b60e8680fe12b848e799ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x1293C 10616 bytes
font_03_sfnt_off00014169.bin
5d44366b3a34e40d8acf4971aa54195bee3ac0d35e48dc2236579a549ae2fa7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x14169 1964 bytes