Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9def12b7b2001a9…

MALICIOUS

PDF

79.5 KB Created: 2021-09-19 21:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ca4d1bb66dee866a00e64d1ef2bd507 SHA-1: 3e3b5f2247623b01cafa0d2e7ebdb6e936027e46 SHA-256: a9def12b7b2001a96266fa28fba326f10cbde6e924eb2bb7dfeb101fb93f2105
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and is flagged as malicious by ML classifiers and ClamAV. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://eschool365.in/js/admin/uploadfiles/file/wisesufamepifo.pdf
    • https://ice-group.pl/userfiles/file/13769956642.pdf
    • https://atrax.hr/files/81757643243.pdf
    • http://retailcop.ca/files/12269178207.pdf
    • http://tivati.com/uploads/userfiles/file/73345409007.pdf
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/93342109718.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/mvn8nbd8m65ml9krmmvjhijrj1/68294251533.pdf
    • https://interangkorcondominium.com/userfiles/file/vewawavujagewo.pdf
    • http://msslink.ru/userfiles/files/90880017764.pdf
    • https://minhvuongthuphap.com/upload/ck/files/zoritilirofulibulevot.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130ecc554107---74194930636.pdf
    • http://frutapacargentina.com/ckfinder/userfiles/files/jibarelalesolagujiriroxi.pdf
    • https://vwb.mrv-educationservices.com/content_file/files/62639817445.pdf
    • https://coherence.cz/userfiles/file/gilazotagamemudisedemusig.pdf
    • http://humanitool.ru/userfiles/file/27451031390.pdf
    • http://preiswerte-unterkunft-papenburg.de/mediapool/fitebufula.pdf
    • http://kamnitikamini.si/upload/files/31577238021.pdf
    • http://giovanninociti.com/userfiles/files/37142695384.pdf
    • http://internet-trade.cz/UserFiles/file/82075816133.pdf
    • http://vizugy.hu/uploads/files/xopajukek.pdf
    • http://www.tokyomagic.jp/images/library/File/26827602568.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613dae6c43e24---xogalazabof.pdf
    • http://dycelife.com/userfiles/file/perijemirelulugogolevomog.pdf
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98979065358.pdf
    • http://qazaqbanki.kz/data/content/files/19971733898.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=create+interface+in+android
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b946.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB946 16792 bytes
font_01_sfnt_off0000d15d.bin
a8ff1c39c0bbbfa2277e6850acf63e92ac0d3d43d5e94525d2d587c1d684a069
pdf-font-stream PDF embedded font (sfnt) at offset 0xD15D 10284 bytes
font_02_sfnt_off0000e8a1.bin
d1ebf7a063639a362adb8d9e6f28f8bd8450620c8322ea01dc89aefcae60c268
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A1 19232 bytes
font_03_sfnt_off000119a2.bin
a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119A2 16164 bytes