Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b99ff773a3bc53…

MALICIOUS

PDF

81.7 KB Created: 2021-09-02 21:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d0d16a8cb550c3ed87b64fab14ba6029 SHA-1: d946c982b70759e016b10b3fb71d82042b163f4f SHA-256: 28b99ff773a3bc53d1b591486b0ad6412d4e0f53af0e8f83cfc897e5884cf412
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=acls+algorithm+2016+pdf+aha PDF link annotation
    • http://photo-preiss.com/upload_files/files/35525621061.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/32168535905.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/sifiwupubetiw.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/34877515833.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/batewipuma.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/8877053167.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/38523533062.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/80fe71145499ad2f6f45664fc418a3d0/55711689176.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5976dd0b0a---zedifi.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/bafupurunuxugakowuzu.pdfIn PDF document text
    • https://oversaslogistica.it/file/63418191076.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/zewuwiwapokeje.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e3d2bb1f5672c71868640cd43795e5c0/47073156846.pdfIn PDF document text
    • http://mchs67.com/clients/6/60/601da637195afcc8544498be66ee72b0/File/45137518645.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/8535471f3923ecc8ed53b69ac7cbf4e4/fekuwivalitukogikewogunu.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16124ac2bdcb5f---32413888803.pdfIn PDF document text
    • https://edgecs.com/documents/lotedazup.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b31d2a32e4---molomabujo.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/81865907387.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/qdu7adbme019pjr6dt9875bj16/89631706669.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/58428693634.pdfIn PDF document text
    • https://birudongker.com/contents//files/52032713197.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/74922896193.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/luxuxobomalanewibalaw.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/6f9d6dcb1749fe6a731ac05839a7776b/werexonerejimefa.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_off0000d833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD833 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04A 11272 bytes
SHA-256: 2e956256739cefea3fc7ec0fc2e0ddfcf7e39afe56fc305d5bbbdde45f7d730c
font_02_sfnt_off00010aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA4 17796 bytes
SHA-256: f74b9b14f30743adb3ec70c850f616ab6334f65906aec89f4206fc195c30bbb4

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