Malicious PDF — malware analysis report

Static analysis result for SHA-256 642a1b36456177f9…

MALICIOUS

PDF

95.6 KB Created: 2021-09-17 08:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 48ad965da5ee981dc325e17b02e18719 SHA-1: 795c0e74ee11fbcb7a7fee0a050fea4d9784bf0b SHA-256: 642a1b36456177f92209f2aa80eca4184113a3d290a3eea941a0d61da263231b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on various domains, some of which appear to be compromised CMS uploads. The presence of numerous URLs, including one with a 'utm_term' parameter suggesting tracking, points towards an attempt to lure users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://allytemp.ru/uplcv?utm_term=crash+twinsanity+pc+download PDF link annotation
    • https://pnp-studio.com/fckeditorfiles/file/2879558916.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/d0ij29sv3dqheliahco6epu84d/28558682600.pdfIn PDF document text
    • http://noithatmyhome.com/img/files/77264433141.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/narumenadilaseged.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/vifizopakejal.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/4df6d088fa453f29a437acaaf0b8ac48/merofex.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/27939077214.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/jobuzu.pdfIn PDF document text
    • https://kimcert.net/E/file/wilefifu.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/1565994089.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/32791943351.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/99672509899.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/65122163517.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/70318617466.pdfIn PDF document text
    • http://njchemland.com/upload/files/19336970920.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/85277432289.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/mulovarene.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/23054d61bc31381fb50505984f959dcf/98220384417.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/747d666f1302423752cb68d3a3287192/pexepogutos.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c064080e16---97468190304.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/diwipepomopefadamopafanil.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/30039806378.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/xekudopitubikunujotutipi.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_off00011127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11127 10708 bytes
SHA-256: fff0f2589010e137f24f94216003929a4cb3fcd605e5cd51ea08d8afdff0ebc8
font_01_sfnt_off000129be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BE 17808 bytes
SHA-256: 9057c261908e3596e3685c0a891d5161e7e1824cc2df9544c67360415c790c8a
font_02_sfnt_off0001586b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1586B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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