Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ea0b946cb69ef5…

MALICIOUS

PDF

88.3 KB Created: 2021-09-01 02:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 570063c94ed1e7aa85a75b408c2107e7 SHA-1: a7407f29db32c391a68cf8fa9811cd6d31f937cd SHA-256: 55ea0b946cb69ef5159c4522e096c5cb0cf7eaae6d566d4fceba398edac4b773
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it's designed to host or distribute further malicious content. The presence of multiple external URIs and link farms indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://goldnumber.info/userfiles/file/fugeteladinewotefadet.pdf In PDF document text
    • http://zjgjqmr.com/v15/Upload/file/2021815239552414.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7ec7ddc79---vekipezeladitedudifomej.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/japak.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f16bb8ef3---dasuzubirokakoris.pdfIn PDF document text
    • http://polipack.ru/content/file/4180248546.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/barazinifu.pdfIn PDF document text
    • http://qca.ch/userfiles/file/70482005376.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/76184127121.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/d313c4123b8bed3d540384c316677cd9/mavagikumikonemazu.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/70689980196.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/wujotujonuxukuv.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/9l64evm8hl257gm3pu6ghl78tu/lisexam.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a051551d326---12206323433.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202108150217089233.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/41358477297.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dccb241752---13096742076.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a65497a7284---43082722700.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0c40717ca---foxatogapusakonazigidexut.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/28590209160.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/f0370ef4deb37c8b1cde306b2a20e1d9/39663343924.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d1ccbfd14---bovakegudanilum.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/c5e7b3efb018e718a4f9c3d4d7043f38/8639459901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=tom+and+jerry+new+movie+2020PDF link annotation
    • 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_off0000f2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACC 18616 bytes
SHA-256: 9add763188fbea91bdb3a10177bb9c657d0a5ed6c8081227a894cf323b094609
font_02_sfnt_off00013b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B33 10696 bytes
SHA-256: 45bdf0683bf63b839c67b30bca6b1d7209165b40d20bdd9df47a732683f32bcc

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