Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ca7497db5ea07d0…

MALICIOUS

PDF

83.9 KB Created: 2021-09-09 06:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd74ee89f7fbf2febc8bff77fde753f4 SHA-1: 30fdb23fca4a1ec958579bfe358c983baf778f01 SHA-256: 1ca7497db5ea07d07ddffcfd98e524fdabca4e3e7dede12a6643f7455a73a12a
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 it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The document body was unreadable, but the presence of numerous external links strongly indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/9c914a482759bb4c6e5944f95dbd97a7/38088245371.pdf
    • http://kkslavicin.cz/sites/default/files/file/30135253204.pdf
    • http://starfishdowney.com/uploads/files/kiwawonabifelip.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/17504b5fec2368e81aa211d9d1d552b4/lidasa.pdf
    • http://alibabashipping.com/userfiles/file/savopurijulo.pdf
    • https://orrizon.ru/images/file/bibuwuwamiraluxut.pdf
    • https://bulgariapools.com/contents/files/nopepilevezot.pdf
    • http://twtime.com/uploads/files/202109071848504341.pdf
    • http://chrisdepanneservices.fr/Sites/cds/files/xukavilefeg.pdf
    • http://szjwwj.com/userfiles/file///xuragazejejumupixinopamuk.pdf
    • http://weilandensemble.nl/ckfinder/userfiles/files/33848461393.pdf
    • http://thementalhealthadvocates.org/files/userfiles/file/26545250789.pdf
    • http://tylincms.com/userfiles/files/54731832979.pdf
    • https://tepihtrava.rs/files/85225831670.pdf
    • http://boldogelet.hu/media/38941596616.pdf
    • http://arndt-fahrschule.de/userfiles/file/raxuxevomafawu.pdf
    • http://trumoi-khutrung.com/upload/files/fusigimu.pdf
    • http://soleilboo.com/images/uploads/files/57121200595.pdf
    • http://stadion-zarya.ru/ckfinder/userfiles/files/93850837343.pdf
    • http://bajajsports.com/userfiles/file/14455013884.pdf
    • http://machin.kr/userData/board/file/doluvakudomovikagakoro.pdf
    • http://hanasushichoice.com/uploads/files/kopulogifazubo.pdf
    • http://vit-physio.de/file/vurizerimovip.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaa522b9cc---97506139691.pdf
    • https://nordiskvillaventilation.dk/userfiles/file/78954201531.pdf
    • http://srcchaika.ru/files/uploads/files/sijuber.pdf
    • https://yellowstonewildlife.com/1943833357.pdf
    • http://arcomproltd.com/userfiles/file/gixejumusujaz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=physics+10th+class+notes
    • 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_off0000e1d6.bin
740d9a44d039db5d52908eddaf02b4e32392fa2a41addbb04bdcd747035ad6df
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D6 18260 bytes
font_01_sfnt_off00011159.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11159 16792 bytes
font_02_sfnt_off00012970.bin
b066877055d063825a9f7488dedbc3b5eb66faac38cf108fe2246611982fb13b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12970 10516 bytes