Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb0bdbbae2c67012…

MALICIOUS

PDF

83.6 KB Created: 2021-10-08 07:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d6ed2036fa6e76ea2dccb4758d4add9a SHA-1: b71971f638bd30319376441601bd6f15442509b3 SHA-256: fb0bdbbae2c6701230814c53ffe64cce55ed34ef4612971749350ce152e9d090
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised websites or disposable domains, suggesting a phishing or malware distribution attempt. The document body is unreadable, but the heuristic findings strongly indicate a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://poorclarescork.ie/images/49111568257.pdf
    • https://economiadecomunion.net/ckfinder/userfiles/files/2990991258.pdf
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sejozigesisukip.pdf
    • http://hoanggiaphatland.com/uploads/image/files/bagirowewogodefidelip.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/81834921020.pdf
    • http://3suntech.com/UploadFile/file/20210912200410468.pdf
    • https://mpksieradz.pl/upload/file/lajidak.pdf
    • http://tanphatinst.com/vietkiendo/upload/file/lijurapubanulajiwazudom.pdf
    • http://frangarcia.eu/upload/file/57220990939.pdf
    • https://open-call.fr/uploaded/files/gakuzok.pdf
    • http://oldmotorsclub.com/files/file/ninegevebijejibaj.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1615b92905f4d2---75447174201.pdf
    • https://satellietgroep.nl/userfiles/files/26509095455.pdf
    • https://aspirecambodia-edu.org/userfiles/file/9724048395.pdf
    • http://araonline.hu/uploads/file/tulewesunajedul.pdf
    • http://ankaser.com/userfiles/file/rijefuxiv.pdf
    • http://runwellconsulting.eu/file/file/xaruzoduwipopolimekiju.pdf
    • https://gullyracing.it/admin/ckfinder/userfiles/files/33359742357.pdf
    • https://fnb-concepts.com/images/uploads/files/jowibifijujazelax.pdf
    • http://madonnina.info/userfiles/files/natudivodunovoke.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/68c1af7df9661048952b2b4866c9fcce/25443565986.pdf
    • http://gamboeng.com/assets/ckfinder/userfiles/files/48814583542.pdf
    • https://chataigne-cevennes.fr/imgs/files/kijaremexiwawaduxelav.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/ubi578p7c10frnp1gho0b83lr9/verewurivojezuvasijidap.pdf
    • http://chelseafoodmart.com/uploads/files/telisewolikesozeruvalore.pdf
    • https://rt-totaalafbouw.nl/userfiles/file/visatovedumibodododazosi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=what+to+answer+to+what+is+your+weakness
    • 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_off0000e32e.bin
6ff8fb1da5ba08a34258408b024725980db0fa226a4131f0666c1b0b36665790
pdf-font-stream PDF embedded font (sfnt) at offset 0xE32E 10544 bytes
font_01_sfnt_off0000fb46.bin
7b66018bab187b6f2452d5388a08deec83e8e240c086273d09cb86c9f9d4ab6c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB46 17416 bytes
font_02_sfnt_off000127c9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x127C9 16792 bytes