Malicious PDF — malware analysis report

Static analysis result for SHA-256 814212972df68cac…

MALICIOUS

PDF

84.8 KB Created: 2021-08-23 19:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4c6d602aaf9d81d3e2e948def6f413d2 SHA-1: a2750399bd18f93797c99371ac5dc9ea005bd6d8 SHA-256: 814212972df68cacebf1c668f3003ecd17814a63b99f820f617766c2bcdcbf57
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which appear to be compromised WordPress sites. The primary purpose seems to be directing users to external resources, likely for phishing or further malware delivery, rather than containing executable content directly.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://crewmak.ru/uplcv?utm_term=cost+to+winterize+a+house PDF link annotation
    • http://abwrichmond.com/uploads/files/98566745396.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/bexifarexokevuranepubezu.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/konevavikufofarudadumi.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/ziwatazorosadig.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ecd78687cd7---81666031616.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/91778932958.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3eb073da2---52054925883.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/84333021379.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/826dcd75072ec53afddf966bd85fc3d5/guxuxapabesevugeje.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/funinufoj.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/mobesopebe.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/gb760jnuoadnukn7pjmd283a6e/dewixeline.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/4b23b34cb75c0552ee7e882aedcac46e/80031714254.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ibisamawexivijukidelewa.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/46956576740.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/zegaturikonodaxara.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/cd8a69d0c8ae4aca5ec79172555c60a8/lalesinujiperuki.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/9550283157.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/47675499888.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/e27b8b154ae9633d23bb9c94f4d57855/20087978260.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aafac132c90---woxegulelifozibigus.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/flkth4ea9bjoejklgvkdorib64/nosavidom.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/38167114095.pdfIn PDF document text
    • http://summithigh75.com/clients/867147/File/77499925342.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/61155055460.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/gatofegojoz.pdfIn PDF document text
    • http://tianfonmm.com/d/files/49230975218.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/209100615460c9cc62204a6.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_off0000ea11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA11 10436 bytes
SHA-256: 7589d1a5992ce59ed4d7898aaad77b9eebca9d1855414ffb050cdd89b2c165ce
font_01_sfnt_off000101cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CF 16460 bytes
SHA-256: c75b362dc120fd246d84d4d0eab988a32191dd70daf5298941260c11994f6ee7
font_02_sfnt_off00012c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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