Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dfb0ae40bc4e146…

MALICIOUS

PDF

99.8 KB Created: 2021-07-01 00:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a19156685a53bc57b9ef6903f0aaa72 SHA-1: 7d6967ea9adb16976d212c21790400eed3b47167 SHA-256: 9dfb0ae40bc4e146e453c84b3bbf3ad8dfae5682b30df1b60e4378bf63513032
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous links, many hosted on compromised CMS uploads, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware distribution, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33e159e24e---magupadijizubido.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/8ih6vmoggtkn4bsvn2a7p24eka/miduvapiwesurikef.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d4f7200ae---13180877270.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1305a4297b---xitawapevisumeledug.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/00353987bbf78bdc56d93cb97566228f/favafosaninenimapowevuxi.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/h32j9b8g99o2pgdq7viqgt2kap/kadugerowor.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b440d9e6c69---93312231678.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/5bbb63921bfe8caa4eadb6bf4e13c811/16149111073.pdf
    • http://www.asslar.de/downloads/65870504303.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160751acd9f7ea---59731404014.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d115451e87---58964912419.pdf
    • http://ecohort.com/userfiles/files/fabedadugulabufopu.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/650837aadf13d3332b0583c3a1c3bf0b/6596611709.pdf
    • http://www.allatpatikapecs.hu/images/file/37717382938.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51375d706e---57889549717.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c039c0639bc---burajatixeliwogemunamexi.pdf
    • http://enidbtwcreunion.com/clients/5/52/52e94d62e82ff66504c7d921fc07bf70/File/tapasus.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/a99cpd91j9rqlm35d8oltg0g41/94094401621.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c5ee1b8050c73441e14ef4b15f615626/puzelifavigudufodijupeli.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/07d1a77983947c66a38a996d841f43d3/26318867716.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/fe97bde6255108909c509118963ebd09/50258770210.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/rnjkk5qo7ho1r4qs70lfbke2g3/76150446479.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b5fc259f2---pizijuvazotu.pdf
    • https://gamaconsultores.cl/upload/file/fitupulo.pdf
    • http://centronegozi.com/public/8713428163.pdf
    • http://ballstonfamilymedicine.com/clients/861402/File/84414859605.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=1000+to+1500+numbers+chart
    • 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_off00012247.bin
bf9aa9213494d8b12f33464348727d3da46aa2a377484f370213cec1f5aa5b90
pdf-font-stream PDF embedded font (sfnt) at offset 0x12247 17684 bytes
font_01_sfnt_off000150c8.bin
aee0ad56173991aedf0101dea772a4552b01e45b6e5d4df01e80b2700a10e07a
pdf-font-stream PDF embedded font (sfnt) at offset 0x150C8 10808 bytes
font_02_sfnt_off0001699a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1699A 16792 bytes