Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e59ebfaae7032ad…

MALICIOUS

PDF

79.4 KB Created: 2021-07-04 05:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b6c3e52f2578fc569b2e1094a5dac47 SHA-1: fe8f0a5051e4ed0e2090a716178b2e68386754d1 SHA-256: 8e59ebfaae7032ade48167261f66c46b88c5b1177c08bb9d9ee19db8cb93e52c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it acts as a lure to phishing sites or malware downloaders. The presence of embedded URLs and the nature of the heuristics point towards an attack pattern involving spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://nomylo.ru/uplcv?utm_term=kevin+durant+taylor+rooks
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffb479281c---pulerutu.pdf
    • http://an-ocn.ru/ckfinder/userfiles/files/legopoderixotiwa.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/tmdsh6u9msm93fgdhuf1qkhnav/53423121216.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ff5067b21d9e776a9bc269a10b51c45b/9185249786.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/7591602314478438857f90f6218cfff1/72442882272.pdf
    • http://kath-kiga-bw.de/bilder/berichte/file/roxopuxanon.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d80b2da210a75b52c33944c8e42dd737/38187723475.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/9c2bc616b0151c45b9c915c1054116d9/xatizukoralomuxoketej.pdf
    • http://vce34.ru/attachments/file/juvalojuve.pdf
    • http://www.yoko-ono.be/images/userfiles/file/tolik.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baaa4ec85b4---72763416607.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b3146f7358b---58257233115.pdf
    • http://ahkjt.com/upfile/file/jifosalesulufukix.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abeeea91c71---89773065433.pdf
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/dc103b5b18c5d3369f440fbe519083a8/11785439129.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bffbea58df7---wapuregela.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/5adb7fdf3e2eed3e8808e93afcd94d6f/66671779575.pdf
    • http://ildungrice.com/fileupload/fckeditor/file/zakixuxul.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/4d5bpp7ccs5gt8u3t510nkbl03/giweterozowu.pdf
    • http://rockpapersun.com/upload_mce_image/file/waluniturekul.pdf
    • https://tahubunting1.com/contents//files/pijodiginegenafasutuxivo.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e195f75d8e---25268227536.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/447db61ed221e8e53373e824379bd973/pidelujigewofovogobiseton.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074a5d19438a---13006936909.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16071cbe4d34fd---nevuga.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbb329a9e9---10111502318.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d24a.bin
65bf69cc6a052855c58d0ff6184d3ce787622630e001cee99d16c2cb80f72b8b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD24A 17352 bytes
font_01_sfnt_off0000ffb1.bin
26733a381f5a2a723a84f118e4149593be43a73e882f5d4144206bf01e862849
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB1 10604 bytes
font_02_sfnt_off0001181d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1181D 16792 bytes