Malicious PDF — malware analysis report

Static analysis result for SHA-256 149a9babfec80691…

MALICIOUS

PDF

82.0 KB Created: 2021-09-15 13:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f9d61550b35d489c981a4625d28e194d SHA-1: 642fc8f68643d55436fcaf5914037288ce0c7ba7 SHA-256: 149a9babfec8069112a974356c00844fcbc866d6be795772903f4bed1b38e56d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of link farms designed to obscure the ultimate destination, a common tactic in phishing campaigns. The presence of a URL with 'exchange+365+login' in the UTM term strongly suggests a credential harvesting attempt targeting Microsoft 365 users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=exchange+365+login PDF link annotation
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/83465397841.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/zifejirofofer.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/29954747246.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/22742139558.pdfIn PDF document text
    • http://vhz.cz/user-files/86819236538.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/69123243127.pdfIn PDF document text
    • https://wineart.online/userfiles/file/9260917702.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/jezobizenivuditejezegob.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/mapawaxilufulik.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/93711860303.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/27609983550.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/78663455492.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613affe906af4---vifaxiwufev.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/meribusako.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/novavokegozedafo.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/metil.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/1ca6a3690b016fb863a4bdc1d8507e2f/zonokupukatisomedoro.pdfIn PDF document text
    • https://autoskola-scp.com/files/79239003569.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/pevesavawukumadakurazun.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be9c3a509c---jumepopuribalutev.pdfIn PDF document text
    • https://melz-feu.ru/upload/60808396573.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/87278124953.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/gamirowimiko.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/41189544645.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613165e6b02dd---lavusitenosasane.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_off0000d9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AC 10704 bytes
SHA-256: 85f54302af3f98000d8cf604e1d1f35c450f85d1f0ae946deee2eebcd3eca1bc
font_01_sfnt_off0000f230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF230 18436 bytes
SHA-256: 851489a07c7ebdb62faa5718f90ffc0309d39f8a30b13534c2bc47496aefe724
font_02_sfnt_off0001228d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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