Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4b2329109b4aa2…

MALICIOUS

PDF

86.5 KB Created: 2021-07-12 23:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d77ed5288786d866735689f373fb7628 SHA-1: 9cfe06ed4f43c298f2479c9c4a179f299e127338 SHA-256: 4c4b2329109b4aa2b1160627e3cec9f5b2035c7bb5642ca5dc997e50aa987b60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, characteristic of a link farm used for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm heuristics suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://neoneofitou.com/ckfinder/userfiles/files/28485713341.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/ab9d46a00a876a66f879ad9f4e8c6310/dujifipeluduwusobuf.pdf
    • http://vhktn.at/images/content/files/80719224103.pdf
    • http://pengyou-english.com/FileData/ckfinder/files/20210707_2DFE5D9F39D7820A.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c54c6941592---surepofufarufika.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d673f53285b---lexunobokokaniw.pdf
    • http://niestachow.pl/data/aktualnosci_imgs/file/nijubowuf.pdf
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/1802111679.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/1cf368d15ad9a7764d2e8e1d815f23c4/42125439408.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160d061c306ba1---29466616651.pdf
    • http://arohitourandtravels.com/userfiles/file/gikibevigajakesol.pdf
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/29129358654.pdf
    • https://ppuhperspektywa.pl/files/edytor/file/37214016501.pdf
    • https://alzubidi.com/userfiles/files/danolaliz.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a51666b3d1---basaliwokofolisigiwujamu.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16098c03a2fb54---wikatawagagufudisidi.pdf
    • http://k-souz.com/userfiles/file/sazimegilolon.pdf
    • http://minhnguyenvn.com/uploads/userfiles/file/87805175003.pdf
    • http://schokobrunnen.com/idata/pofereweluxodakujepagir.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609830245679d---17466827713.pdf
    • https://iwanbim.com/userfiles/files/sokaminivibalad.pdf
    • http://otczenacts.com/media/files/pusivadepizazerodok.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607c895b7cc33---57565914766.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=what+is+the+least+common+multiple+of+4+and+8
    • 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_off0000efc8.bin
c39b561b4b22082da0ca7977f8bde635cdcaf4c2386b934da99771967b8f340d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC8 11164 bytes
font_01_sfnt_off000109ba.bin
17877a0112fa57c26bd6adb1ad0e769803492f84815c92060dea610d3923f6af
pdf-font-stream PDF embedded font (sfnt) at offset 0x109BA 16556 bytes
font_02_sfnt_off000134a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134A6 16792 bytes