Malicious PDF — malware analysis report

Static analysis result for SHA-256 a96e1c2f98865c3a…

MALICIOUS

PDF

94.7 KB Created: 2021-09-12 13:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab712f1ec9f825427afcc1959ae992cf SHA-1: 9ac021b9047bc3657af5b14a02be607f1a75aafc SHA-256: a96e1c2f98865c3aaf2cba869770349ec8a456ccce4e16ffbfefc3c61fc0566d
176 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to disposable hosting and compromised CMS upload directories, indicating an attempt to redirect users to malicious sites. The presence of a QR code lure further suggests a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://sinorarechem.com/upload/files/kerumetusodaz.pdf
    • http://cherryontop.pl/upload/fotki/file/59215704435.pdf
    • https://codecs.ro/images/file/sesuzakurewobivisugi.pdf
    • http://ngocvietbungalow.com/upload/files/19804381917.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130747b319ef---1257995867.pdf
    • https://lentes123.com/aym_image/files/78704128453.pdf
    • http://basketaci.cz/UserFiles/File/13913015377.pdf
    • http://startent.ru/SITE/files/editor/file/ximavasewegijineradi.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b345a41706---walefivumebivemed.pdf
    • http://zamgph.com/uploads/file/060400502241.pdf
    • http://saktigroup.in/uploads/luxaf.pdf
    • http://cerrutistudio.eu/userfiles/files/fusosijorovugomip.pdf
    • http://acelybio.com/upload/files/58568127890.pdf
    • http://a-aqua.fr/ressource/site-image/files/vojusiviro.pdf
    • http://telecycling.org/files/file/20699940205.pdf
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/virolilutamurifesanefevo.pdf
    • https://radmangroup-ye.com/rgfiles/file/vabuxu.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/481d199d1b3b47c4481211faf35ebe90/21344738164.pdf
    • http://gidromall.ru/img/uploads/file/8397860288.pdf
    • http://spad.kr/userData/ebizro_board/file/55591459214.pdf
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/58577816593.pdf
    • http://www.slenderclub.cz/ckfinder/userfiles/files/megufifexubirenegazuvokoj.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613db57c585c9---13626918964.pdf
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/zudutinakitogadu.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/f64032cd26804952ffb84331eb4fc70c/67780846592.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=android+system+akku
    • 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_off00010edb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDB 16792 bytes
font_01_sfnt_off000126ed.bin
85f19808d21a594d3507a82f3d516c78b83db15a73b8a516e71895fe3ce8461c
pdf-font-stream PDF embedded font (sfnt) at offset 0x126ED 17716 bytes
font_02_sfnt_off000154ca.bin
06c7010fdb06880d11fd143c4f714a95c9aaa782d96dc57b4dda2230dad925f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x154CA 10652 bytes