Malicious PDF — malware analysis report

Static analysis result for SHA-256 88596d045e142bb7…

MALICIOUS

PDF

75.2 KB Created: 2021-09-13 15:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a9879190d754beed188b6edb6282ea41 SHA-1: 53684b6c0280e90b39fe10edc3b3e1600accb826 SHA-256: 88596d045e142bb763a7ea3f6f2f0cb690addc7dd1ebf095ea732624349f0696
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the nature of the heuristics indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=redmi+6+latest+update PDF link annotation
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/67kd0auj400e714hfl8786ttno/92943115630.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/88913621119.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202191021063340.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/41773463333.pdfIn PDF document text
    • http://vejwun.cz/images/tojukuwagamimoruxag.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/63596122161.pdfIn PDF document text
    • https://heureka-cz.eu/files/xowizofuxaxiwenefafa.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/lafevigowa.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/0b25fa61e4d858a223f18e7a8034b8d0/72368677932.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4cb75ec0e---65881717979.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/33061638488.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/10279909242.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/tolumaruwokafijovemi.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/bupaxipomidakobajun.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/nigil.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/2885001229.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/64223694817.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/22364081237.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e76fa3a73d---19454184066.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/25169396678.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/40357351118.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/96060231427.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/53750372478.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/57125697588.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_off0000c3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D6 16916 bytes
SHA-256: 31eaf0e14eb0bd13562737d8ab3ee97cea33c8a5059393119925516180d9c091
font_01_sfnt_off0000ef34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001074b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074B 10544 bytes
SHA-256: 6c805cc5686a9b8909331e34cd56d9bae265df084326118295767295c6b9b361

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