Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f7859c5fee105ee…

MALICIOUS

PDF

91.5 KB Created: 2021-08-29 22:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3f11b29b781d38d82e737e9583581f3b SHA-1: 81d2bde1175b5183173c30f61b86a64fadda023d SHA-256: 6f7859c5fee105eee27e796ffbdf7d1bed60447eff9303e16298bb7df630e0fe
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users to malicious content. The PDF itself appears to be a lure, likely for phishing or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://laborke.ru/uplcv?utm_term=impedance+for+capacitor+and+inductor PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608236047690b---32345065575.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/aikn77algi42g9t2gftmcivovq/11834226231.pdfIn PDF document text
    • http://spiregene.com/image/files/20210720_041800.pdfIn PDF document text
    • http://philboyd.com/rejujavoribaw.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/jaxidorevanakutopokixiba.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/vomalatim.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/0a7771e95395403bd0ac3b7086f7f20d/99940516848.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/46879873630.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210626_1C69B6144B858972.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/5l5demhsj35bslpcgv413j9il7/fimukotamefus.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210727224709.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/c7530e322d43d43ff5b9f55b606fc450/wuxewugomeninib.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/25819529591.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/24886866419.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/92d6f6666037199bd03958783c4cbf42/38345549997.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5bee64f3f---raduwedejotule.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160910cc3c892e---89229070919.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/c5b1cf000f7cac0d8f89a624b00c6942/todelesodijavegivejazek.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c80083780---12509086884.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/mobapuj.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/nesorekudareruj.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210822_15DB0050F70C3DC2.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/pawogiwigozejagoxil.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_off0001032f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032F 17332 bytes
SHA-256: 382853dee8419b5dc173cf38d4a1eccee8f238f42afc9c1a40f3c25e69176586
font_01_sfnt_off000130ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000148c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148C4 10620 bytes
SHA-256: 1001b6403d07a164f4ecbc4e1744ec47c3c87f7d9b5cf67e9855073b5268bfeb

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