Malicious PDF — malware analysis report

Static analysis result for SHA-256 7007c4a9f66ceb25…

MALICIOUS

PDF

84.1 KB Created: 2021-10-07 05:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ac20098ed49b4fa00adaf4752eec1ddb SHA-1: 68c176597a0bb8b53e4c5622b83d0816412a2be5 SHA-256: 7007c4a9f66ceb25301bce66a25bc2302231206bb7ee361a0c71f765dff3fc67
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs that point to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute malicious content or phish users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crysiq.ru/uplcv?utm_term=what+do+u+do+reply+in+english PDF link annotation
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614142e9c975b---vusatosodovewitera.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/30539630941.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/sumematat.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/javubez.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/morubevikasovoribikil.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/49869722200.pdfIn PDF document text
    • http://thesei.com/In PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/000ab48d0677b6240deabe63945da75d/vodiworesumumu.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/vurofizugedu.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/14466828712.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150c2267e3d3---xejubimitipabaxu.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/869c731a5566c80185bf29ca933a584a/13658122406.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/bomese.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/puzalij.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/57571142141.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/pivumawesenererizasabof.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/29959825034.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16136e4d49e072---kitiridaguxitewudibod.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/55283337895.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210916010542.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/29612558309.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/todeduvakikun.pdfIn PDF document text
    • http://thehbbq.com/uploads/files/16185427726.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e72c427440---vepuvogarebuzevigowu.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE481 19108 bytes
SHA-256: 829c922631dacbdcd016b513fec4a0cc8fa1cdc942a6261909b3291b235f436e
font_01_sfnt_off00011551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11551 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D68 10880 bytes
SHA-256: 90a0b37025365d60b0c6600003f05ce071c4443f3ad835c91bc1d83ca1107919