Malicious PDF — malware analysis report

Static analysis result for SHA-256 40d56de5d5b38fd2…

MALICIOUS

PDF

81.3 KB Created: 2021-09-09 15:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 97aab7c65f59d4d954c0cc2945d09144 SHA-1: 37d69471fac71fbd1aeb483c040bb370ef0f205c SHA-256: 40d56de5d5b38fd2a5c66b56b6c0f08f2b7596de2bc4dedc6521de34abb6f819
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm on disposable hosting, with numerous embedded URLs pointing to PDF files. These findings suggest the document's primary purpose is to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://faw-asia.com/image/upload/files/90370209283.pdf
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/zapaborawejego.pdf
    • http://willajarmar.pl/userfiles/file/viveta.pdf
    • http://tmtechvn.com/webroot/img/files/kiduriwudot.pdf
    • https://pepinieramontana.ro/ckfinder/userfiles/files/mubojutagizini.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135b75132a2b---tanedusaluvunogilo.pdf
    • http://a-mega.ua/images/uploads/file/gixagepoxilogi.pdf
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/segojozitixanefuwukafasel.pdf
    • https://atasuorganiktarim.com/upload/ckfinder/files/bazugawe.pdf
    • http://lifecare4all.com/upload/files/dezekulete.pdf
    • http://asustainable.com/global/file/94248133875.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613925dc75d01---nijoverurifarimopu.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ad25a31af---dupazetotabu.pdf
    • http://gyogytornasz.hu/editor_up/37836273224.pdf
    • http://benthanhsgfarm.net/images/uploads/files/xemejunewev.pdf
    • https://phm.vn/upload/files/ruxuzubibexolibi.pdf
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/88946565267.pdf
    • http://safiorida.dk/operatori/userfiles/file/67278960649.pdf
    • http://www.tobywells.org/media/fckdir/file/11965840687.pdf
    • http://dgxzz.com/uploadfile/file/81888839978.pdf
    • https://youkuvpn.com/upload/files/65542284700.pdf
    • http://rulada.by/upload/editor/files/zunem.pdf
    • https://tp-pos.com/uploads/image/files/78904599861.pdf
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/zigixawusisilo.pdf
    • https://almuhja.net/ckfinder/userfiles/files/wigupifilupejiwu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=kutty+tv+apk+download
    • 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_off0000d9d1.bin
92db44b9380e505669cd961625201f4a894d32736f03476fbb8af698b5193e95
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D1 17788 bytes
font_01_sfnt_off00010801.bin
4e3c2da687e1282bbf6acf5df2c9d175645acb51a4baddad5e2304ced302cf12
pdf-font-stream PDF embedded font (sfnt) at offset 0x10801 10340 bytes
font_02_sfnt_off00011f82.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F82 16792 bytes