Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c22420251ca7994…

MALICIOUS

PDF

72.2 KB Created: 2021-09-25 19:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7878a4272802a3a9c88a2bc531fee518 SHA-1: 5645565f38020afb245f1c3cc3957aaac7421e00 SHA-256: 4c22420251ca79944622a40390e7ea5545d1785e5400839d8db6809de7b7fc26
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous disposable domains and compromised CMS uploads, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pixomot.ru/uplcv?utm_term=advantages+and+disadvantages+of+rooting+an+android+phone
    • http://cichanski.com/Upload/file/najimu.pdf
    • http://vdadanang.vn/app/webroot/assets/files/fiwegofekofuvezufuzuxiw.pdf
    • http://zhongjiukeji.com/upload_fck/file/2021-9-21/20210921104621468431.pdf
    • http://dj-maily.com/uploads/pages/files/soxuzisizamozokebisegag.pdf
    • https://davidfoleyinc.com/userfiles/file/noxapozejupoxe.pdf
    • http://starfishdowney.com/uploads/files/pixajorad.pdf
    • https://www.eos.org.eg/ckfinder/userfiles/files/wupujufokorobeduja.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614168223d2ea---96029479556.pdf
    • https://0955205219.jwa.tw/userfiles/files/wokipuluxak.pdf
    • http://wu-pao.com/upfiles/editor/files/saxifozimabolorajaxe.pdf
    • http://hotelbellevuepalermo.com/userfiles/files/zavabod.pdf
    • https://blueparadise.pl/userfiles/file/wogomojirigefufebume.pdf
    • https://nangluongvada.com/uploads/files/67540736310.pdf
    • http://bociany.sk/media/file/66428305279.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613029f7d365f---bowifogenenof.pdf
    • http://bscartridge.com/pic/9090116006.pdf
    • http://zjqzzx.com/uploadfile/file/2021090412373473499.pdf
    • https://tavio.ru/files/file/medabomalik.pdf
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/2956227159.pdf
    • https://gberwanda.com/gbe/useruploads/blogs/files/boxavowatojapa.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16140375c04070---24658463523.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_off0000b4f2.bin
2cb6ef731b1d7bb41afbb430a9399748964b05a5f82a3caf620266d9a0612d74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F2 10776 bytes
font_01_sfnt_off0000cd8e.bin
788c45ff94d402d6dd1dcf379a790551c5320d1739d454817b78921d17526af6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8E 17608 bytes
font_02_sfnt_off0000fac3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC3 16792 bytes

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