Malicious PDF — malware analysis report

Static analysis result for SHA-256 774ac4be3492089a…

MALICIOUS

PDF

75.7 KB Created: 2021-09-16 07:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3c3c54d840003d7cdf305b744eb4e43 SHA-1: 999b708214872940f033e3f8c2f604e04b0781b5 SHA-256: 774ac4be3492089aa2426ffcb4001b2fe6173d0c20b3a1309c2e8d118f047519
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially harmful content. The document body is heavily obfuscated and unreadable, suggesting it's not intended for human consumption but rather to facilitate the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://mobitransjogja.com/files/noxuzobofitipupova.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a89faaa943---fukegepiwezibedinepu.pdf
    • http://www.biosafety.biz/ckfinder/userfiles/files/tiladusavejazura.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/9280035037663ed7242495ca8fe16c31/87525538509.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/2320130713.pdf
    • https://heart-calligraphy.com/uploads/files/202108312221588740.pdf
    • http://a-kamen.com/userfiles/file/rezifumafodufalekajibo.pdf
    • http://studiogiamberardino.it/userfiles/files/86802552547.pdf
    • http://ediljolli.com/userfiles/files/31918885857.pdf
    • http://peaceinsrilanka.lk/userfiles/file/3663235603.pdf
    • http://gidromall.ru/img/uploads/file/vubujaj.pdf
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/lowufetugukulujejuka.pdf
    • http://schule.havonix.com/ckfinder/userfiles/files/41774934372.pdf
    • https://rumputhijau.com/contents/files/tolakezuboxu.pdf
    • http://viorina-deko.com/images/file/gunumimaludataratasok.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb38dba90c---disezudimevenosozowu.pdf
    • http://togclick.com/media/userFckfiles/file/wapemuvafotojuziwisu.pdf
    • https://darkoyunpin.com/calisma2/files/uploads/bixawakif.pdf
    • http://agt.es/files/galeria2/files/25211900908.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed1545e163---62007798929.pdf
    • https://fototipia.hu/files/files/punaxobulu.pdf
    • https://securitydm.net/slicice/file/84291654428.pdf
    • http://prplus4u.com/ckupload/files/44456825177.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=ultimate+car+driving+classic+apk+hack
    • 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_off0000c2f6.bin
a2d7b27d2245060e4221119a4ec3d892e3606ad5568c2f10e9b605e19a65c844
pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F6 11004 bytes
font_01_sfnt_off0000dc20.bin
882d9a34bafc9ee7202a7e6035d9e2e4a1de4ba17ec2cac9d132694600f33372
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC20 17480 bytes
font_02_sfnt_off000108cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108CC 16792 bytes