Malicious PDF — malware analysis report

Static analysis result for SHA-256 41badf2e4c15eb9d…

MALICIOUS

PDF

98.3 KB Created: 2021-06-30 09:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 393ef357bdfc2ae6b64791e2b20db84f SHA-1: 3ce179ef247ceaf962406b4c5bf7ffbb5776d42a SHA-256: 41badf2e4c15eb9dbbac56a12bf5f8b2a449ca404c2ea9b91c880ba909e7b24e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content or submitting sensitive information. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://archism.ru/uplcv?utm_term=things+to+do+in+appenzell PDF link annotation
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/bbf6e462fb8899ea1eb7e7f268d604a6/13989671130.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c53e845f9e0---pamamizuvawapamumipexawiv.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c58982dd03---zakeguzevoxu.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/hk110egg33gnnh29otfcldajr0/kekaxumewelowaxu.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c29b01ac7b3---96251240346.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/51ff63e841d27c29ab8f3cf16c5ba7de/faguvupovar.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a049f690d4---vufudem.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e2368667b---74032766578.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/b8dd4a3a33364ef16d7b99a97c9a03bc/34327637954.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/33721903516.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fc8ba8cc9---doxejizodek.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/6ee1814eefb4d690e69b73db519b4918/25289561578.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb89fe77129---jinavuwo.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd07d4937---belulitiragogerijuwine.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/vemixapogemiguwisir.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/jlnh69fhp1cb0664vak0536rl0/niromerusinote.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d559e0d803---vinutesefotutasexupibanar.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/14589045589.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/16415577860.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/vozikepipilanas.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/7986583894.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4e74ec2fd---batosu.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/gadewiv.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/0fesaa3tj9dso8cpnv6v42mqi6/6619491257.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B0 18276 bytes
SHA-256: 16ef6c97139397662582d19f5c81e78cd103b396be0da0ff7a3eb74d00fcef32
font_01_sfnt_off00011dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135CC 17312 bytes
SHA-256: 675fd123d143e58e6b63103d356fdc47c9d274ba9259ec3566b1023217659a62
font_03_sfnt_off00016241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16241 10596 bytes
SHA-256: 683b63deed090bec2632d0c9348dff5e3e1efd3ad81d911f9352c72475281260

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