Malicious PDF — malware analysis report

Static analysis result for SHA-256 3185ba063fa41835…

MALICIOUS

PDF

172.7 KB Created: 2021-06-27 00:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ab8004bc8b90e9252ccdb79e5733d605 SHA-1: 5a5b5a8b2544ed1f61c82751417137e0c3df682c SHA-256: 3185ba063fa41835394da3d8a1d8f4c80e286fd18d635e56f9be47a3c75c41e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external links, many pointing to compromised CMS upload directories, suggests the PDF is designed to exploit vulnerabilities or lure users to malicious sites. The primary attack vector is likely spearphishing, with the PDF serving as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9707

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=south+suburban+spay+and+neuter PDF link annotation
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/d5cc6d99246bba52821a1e17da345486/34652764919.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16092eb92dc18c---93623817366.pdfIn PDF document text
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/porif.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/06uctgeddoreaciu1a1cjrl703/vojarawutixeregixupetijal.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/2877621191.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/k39q465r9juvpb2c3gkpue5jft/20567686054.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071e423cfe1c---sedomusovipi.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b6c51fa4---80043704453.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/5af517ba869c3c0568a139c9c9f20610/wemigene.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/81173164339.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/merago.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b455201acf5---86169792588.pdfIn PDF document text
    • http://ehhs1969.com/clients/6/67/67a0fa02f482ea8575b7cec7429e43a8/File/91371007700.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef925ed1ad---zepunafanemano.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/88589184224.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/b53b5a96997176e22b847a0cd344cc5e/zusotarerodirij.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa5f54f564---baratavenosidabefofovuku.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/88543c34dfcc37b419d4020590371ed0/74895299092.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b744fb2fd1b---16515176445.pdfIn PDF document text
    • https://edbcagliari.it/file/97913777782.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/bedutudupetuxufamigugix.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/inhpfu2aq9tiunrhivuici2c56/14376749666.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/5dq03g7s173244af33bf3j5nd8rn50p4/barokevibijumov.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/sosusimolemefenukavoxi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0002889d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2889D 17868 bytes
SHA-256: 87b572e770fa3c8b868655b940bd4a44ece0458a1922bb2c32d823d39b52fa65
font_00_sfnt_off00022301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22301 10780 bytes
SHA-256: 406f9cfd6ff95f7c32c7e9766a06fec9620963e2ea306a182fb06aa5941fbe95
font_01_sfnt_off00023b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23B91 21224 bytes
SHA-256: a36fe380350c9a3caf1c7f9aaff23250cc47d90ad0e1caa543c1a6c22b536202
font_02_sfnt_off0002708c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2708C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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