Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f928322f5e60997…

MALICIOUS

PDF

83.4 KB Created: 2021-08-08 14:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 664560ddbfdc88e22bee325033982755 SHA-1: 18568e1d97981abadad489f17ebd379c3e38855c SHA-256: 0f928322f5e60997868058f2af48a2e6bc7b089e5f85c919e4b2fbf841218681
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 ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress sites and disposable hosting. The primary purpose appears to be directing users to external, untrusted resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://crysiq.ru/uplcv?utm_term=enjoy+english+11+%D0%BA%D0%BB%D0%B0%D1%81%D1%81+%D1%83%D1%87%D0%B5%D0%B1%D0%BD%D0%B8%D0%BA+pdf PDF link annotation
    • http://apexnepaltravel.com/userfiles/file/20697165806.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1685285f3c65ae41006d460692f951f6/terobutakorodovow.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/dufalut.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/2ac691d9c17130a8d45c37ebbf2858f7/fuvakufamaxezexefigip.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de515ebef7---56754461915.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfe0229e63d---36369446340.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/patugub.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/67257723086.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adfeb8c194a---69354014705.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/310a7784eb1b008b59cb0d76e552c65a/18406453432.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ad32aa215---7396589757.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb5a01d029---delupozakesijuka.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610a1ac4a286b---xafagixagizez.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/47606680541.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/jobaxopotod.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/0e9fe43be117c5f8694b92bd83632881/wivaxalolamezazu.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/26741197792.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f91bdb51f---60721562133.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c85cabd0cf---14851519914.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/jsmfd37tqv703fsso7v10ivq66/1216847386.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/5ug10ks75chtmkts4rq4d5fod0/jurewegikirofabejiv.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/putakugabesib.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/25082691475.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/13182506151.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15C 11888 bytes
SHA-256: 5eb5a4eab0b8310f72ac7a77a4368e72bd3200c858e3464d85aa1098f8d573e8
font_01_sfnt_off0000ecbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBE 22340 bytes
SHA-256: 56bea49885913b2168b4c2a8da0033e48c19de770ffae450ca023b67fc6bcc40
font_02_sfnt_off00012457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12457 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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