Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4eb517156256d27…

MALICIOUS

PDF

77.4 KB Created: 2021-09-01 09:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 98074b3df016a7d6a93654f994bb2c31 SHA-1: 8d6043758f960744026a3818409086f307aa397e SHA-256: d4eb517156256d276e9c052c3f3c5c3395b74d6fe1181212d7474fa329c4c475
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to host or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URLs point to a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a959e43f314---wojuvomedaru.pdf
    • http://micronforgacsolo.hu/UserFiles/file/43514465886.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/5ce4f624e7c7500e4b2ed499f8ad5453/64292105668.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16084f17f98c7d---renuvometuxiwofezoju.pdf
    • https://vcvscr.cz/www/www/fckphotos/file/8472786564.pdf
    • https://sheenabusesandcoaches.com/userfiles/file/susipogasilitekat.pdf
    • http://maciejabramowicz.pl/upload/files/file/suxoxanadaxe.pdf
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/79802610306.pdf
    • http://tryinvest.eu/userfiles/files/78322441107.pdf
    • http://adamlegal.com/userfiles/file/kutolesulafezalukexujuwiw.pdf
    • http://dorrstrechy.cz/UserFiles/File/liziralebew.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/i8rq427pve6kcgh9oig3iqc2e3/74226312513.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160961c75f1c03---5779831837.pdf
    • http://www.cafeinca.com/img/public/contenido/file/28646675040.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071de6972744---sasozutukowukawazipax.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075b36acc72f---40113112257.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/bvvrv2l0c5otdusltntpntome0/nopus.pdf
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/zitozofixoda.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b7868d60163---99868410580.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610b0a23b94ce---54634797854.pdf
    • http://findmecakes.com/userfiles/files/21604384796.pdf
    • https://self-storage.sg/images/uploadedimages/file/57873666285.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608763899291d---livenizijodukotujexo.pdf
    • http://2478.ru/admin/ckfinder/userfiles/files/xigasosovowul.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=magnetic+field+and+magnetic+circuit+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c63b.bin
a1859cd27d9566b70a5defb518b237f604f5edf256760c2f7cc9c104d1258a86
pdf-font-stream PDF embedded font (sfnt) at offset 0xC63B 18144 bytes
font_01_sfnt_off0000f54c.bin
eb4b33dfe2cce31331b66a02c0019d45e32bae7075e34c88f4c7fbb242f5d5da
pdf-font-stream PDF embedded font (sfnt) at offset 0xF54C 10768 bytes
font_02_sfnt_off00010dd3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD3 16792 bytes