Malicious PDF — malware analysis report

Static analysis result for SHA-256 c94c1f50b88e71e0…

MALICIOUS

PDF

80.8 KB Created: 2021-08-02 17:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f6cf62540e0900744b01945e18fb99e SHA-1: b4c7720989de13fecd430ce9f9f1877c34f02a1d SHA-256: c94c1f50b88e71e0f072e1f44c97157ed7996e1a356137a9b5f7bea1f4ee0481
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories and other disposable hosting. The embedded URLs are designed to lure users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://kimthienbao.com/userfiles/file/28054510992.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609affd20ea4c---nesorusoguvugerusufipubi.pdf
    • http://nano-vip.com/ckfinder/userfiles/files/61651462158.pdf
    • http://studiobaliva.eu/userfiles/files/josipeguvefugedu.pdf
    • http://wtmongolia.com/materials/file/rovisowekekogadijifabaxoz.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0fd9ae5e6---30560986864.pdf
    • https://alamansyria.com/userfiles/file/vawumewigeganasebaf.pdf
    • http://xn--szabowski-tub.pl/userfiles/file/zutijonorutobamofodomem.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3631092c66---tatul.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/b0d93d9f3cee66896019c7a41f7ed023/rufebesejaze.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160db711bef1b8---17534058693.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/90cfef17bcd1b8ff891dfd8e7ae25561/biwipa.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/680dc127fb7031f6d87e354f352966ba/paxegubukejinekisijozupud.pdf
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/55927829301.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/ecc5a671aa752269de4cf8fab0e3161b/46424328608.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cbec17b53---51451051831.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/qt2vb8rf4sgj9u2aqc30ekhrp9/tegudoselotuberinek.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/bf14112e316970114755c3ad1cbf1674/26913388782.pdf
    • http://archinfo.ru/uploads/file/xunubulikaxakimavawud.pdf
    • https://terminarz.online/kosmetyczka/krakow/files/5974657232.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160749e5ea1e91---98025282536.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/5jcv4nshh5o47o61gvluud0rv4/kazosatabowatatusalodu.pdf
    • http://vaonhaphatphap.com/images/uploads/files/nitejekolavanepenozi.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/40c6b47a32e2bf8e66141cb12481197c/26273863627.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=watch+the+carrie+diaries+season+2+online+free+123movies
    • 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_off0000d8a6.bin
5f2064deeb35256a6420d4e93a337227b0237a1617b1fe8f09d606b75d7c460c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A6 11144 bytes
font_01_sfnt_off0000f2a9.bin
f8a14295537437a780ea91ead82f279b64cba84d7d11ec68446c0e64a3746dfe
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A9 16196 bytes
font_02_sfnt_off00011cbe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBE 16792 bytes