Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f7116eeb0e3149…

MALICIOUS

PDF

91.0 KB Created: 2021-07-03 11:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e6390494480b6d593b15bcfe26b31e75 SHA-1: 7e9c42021f890ac23d38e0867230d34d34bbb27e SHA-256: c0f7116eeb0e3149b18618e751d79912c78dc1164400fa601b7169299d0f000b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified the PDF as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF format often utilizes embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/197b735265e9f0545aa7ff0d3fc45c2e/57336466966.pdf
    • http://a-daily.jp/app/webroot/contents_img/files/jigiguda.pdf
    • https://rosycaffe.com/file/nukumeteposorabuzofo.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/226e5d8d2dea68ff17654820743b46c0/noxibunosedozalazi.pdf
    • https://baxsporthorses.nl/userfiles/file/60254757065.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f275ddcdb---taxetuzixenin.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160705d53a2e0e---bojubinoxif.pdf
    • http://fullx.net/files/80511983110.pdf
    • https://dodomacnosti.net/data/file/89652641799.pdf
    • http://emirates-offshore.com/uploads/image/file/bofabilegarivevorovogubod.pdf
    • http://ruegen-ferienhaus-schneider.de/userfiles/file/pobefusutox.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0213300b2---kimekodipavovufumulixagub.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/bq25803e8jihocrel0foup9j3a/gewejolabevapeb.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/eprlr1l2se3vic5kfg62drgst5/71918377388.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089caebe29a5---sewavi.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16081c3743d481---28059850475.pdf
    • http://goldenpeak.it/userfiles/files/19402033214.pdf
    • http://popnmusic.fr/userfiles/file/gimej.pdf
    • https://mmszke.hu/files/file/34072157718.pdf
    • https://memoservicesrl.it/file/lijuz.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/atheaokk9gep6dv9ss6eo3deup/pexuboludivaxivajafuxev.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/cinl4bc522p6jg6sjdsasd0cc4/36186564027.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=i+am+on+leave
    • 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_off0001004e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1004E 16792 bytes
font_01_sfnt_off00011860.bin
0f8656cd144a21066052cb31bd3573ce89b6179d15b4d4bde11fb4d719e928b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11860 18020 bytes
font_02_sfnt_off00014838.bin
6ba488ab870693d9b78af40d89d8f7634e85cce2d1984be4449b62a0d2adef7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x14838 9828 bytes