Malicious PDF — malware analysis report

Static analysis result for SHA-256 a68a8e99fc837361…

MALICIOUS

PDF

93.1 KB Created: 2021-09-23 19:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb6bae1b62980085f4c8354b8778a9c5 SHA-1: c3678ed9b7f5ee803d5dd98a8051aca33beb8371 SHA-256: a68a8e99fc83736161b693fb87b8c8913fb7afb039ba88049cf866864ee2eac6
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous links, including those with UTM parameters, suggests an attempt to lure users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://catamma.ru/uplcv?utm_term=space+movie+1992+watch
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/pilugikivanokaviduxafixuz.pdf
    • https://stichtingech.org/ckfinder/userfiles/files/mifenekuvareniro.pdf
    • http://jjw-led.com/userfiles/file/2107498796.pdf
    • https://myphi.biz/nbloom/fckuploads/file/fajetapolujojasuweb.pdf
    • http://sksound.com/userfiles/file/68385823463.pdf
    • http://zubrcup.by/files/files/rewirobaruwoton.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614279a52fc10---30120733049.pdf
    • http://blpest.com/UserFiles/file/52691290688.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/5fb0b1d9dd7560f1d9896d2902b86274/varukiwajevovukifakot.pdf
    • http://drukarnia-warszawa.pl/pliki/file/39814249849.pdf
    • https://cokhivietuc.com/img-vietuc/files/sobosazeretefabatas.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/jazinuziji.pdf
    • https://mysilo.com/upload/ckfinder/files/32228721114.pdf
    • http://ekorob.pl/userfiles/file/74612134652.pdf
    • http://movediary.com/userfiles/file/kemotogofuronuduxudotibow.pdf
    • http://teplo76.ru/uploads/file/gepofuraxikozozolagiju.pdf
    • https://aykutemlak.com/upload/ckfinder/files/46953168326.pdf
    • http://shukokai-voves.fr/userfiles/file/loxanodabubuvo.pdf
    • http://dfanchem.com/upload/files/43370619345.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/6ed6f19d275d912b92fd5c990e81a9f7/sobemotefudi.pdf
    • https://muachungbaohiem.com/uploads/userfiles/file/ripesegasedagusidaseru.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161455d27e8589---jovumufigilumemolon.pdf
    • https://mimpisiluman.com/contents/files/lijasimuderenivijutak.pdf
    • http://thamcohoaian.com/webroot/img/files/68646907821.pdf
    • 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_off000104ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104EA 16792 bytes
font_01_sfnt_off00011d01.bin
65f8ab30133fb733a13c3623394ef3e59cb4b34c7dc4becf001e68fe8815398d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D01 10788 bytes
font_02_sfnt_off0001360c.bin
afdcc082a645a36905b184717da8deb1e9d01606afa686895c42bd94b4485360
pdf-font-stream PDF embedded font (sfnt) at offset 0x1360C 18832 bytes