Malicious PDF — malware analysis report

Static analysis result for SHA-256 fddc2be33a9683f5…

MALICIOUS

PDF

74.4 KB Created: 2021-06-26 02:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a15d3c235c9a3c3b95a62f993af8d786 SHA-1: ee8b7513565f2ccdfa9c4a3deb766e1e9fb244b6 SHA-256: fddc2be33a9683f579c74ea40dcbeb4907a7f2879537c5cc61bcd0a6d3a5dfb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to malicious sites or download further malware. No scripts were extracted, but the structure and URL analysis point to a link farm used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://123natura.com/stockages/files/57583548902.pdf
    • https://led7.ru/file/824447689.pdf
    • http://faradbox.pl/files/file/46526486222.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/895e094705393329197b799dea62e207/25412575397.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/e390791539a1c04892e888245f66e14f/31630160476.pdf
    • http://ingatlantv.tv/userfiles/files/65407492106.pdf
    • http://7166867.ru/ckfinder/userfiles/files/77524827023.pdf
    • https://houstoncoinshow.org/FCKeditor/file/sedafoporor.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/u89u6560ljleefe84v70lgpdrd/9444755796.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607024b640cd8---fivotuzejagojenuvexokar.pdf
    • http://thunderstar.cn/userfiles/file/20210504105804862171781.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/c11e083a612084a1f2e03e8d7d293b8a/16349798287.pdf
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jisarigabofewukugedapila.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/84447590377c3c4c41ee728ea8aeed71/narebevoxodijelalerirazer.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/08471a5543611dbdc9e9c85182753a68/11519628235.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160b1200d8731a---57840046907.pdf
    • http://ampletrekking.com/userfiles/file/76869279988.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de541e8012.pdf
    • http://doellefjelde-mussemarked.dk/images/newsmail/file/93402019055.pdf
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/8vqgp1alr9rpu5c3trfnp2oceo/wonumumegatigon.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/d006be7362df43a3ee2da299fae93b59/bofojoduzasafazixaxeraxoz.pdf
    • https://presstone.hu/userfiles/file/miritetiginevuritab.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160833ac41b405---tidifutokop.pdf
    • https://ludifrance.fr/userfiles/file/kabenawelemuwiweki.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af237dc7e28---dapuxejekok.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3f988e05f---66202089174.pdf
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/paralovuba.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=well+i+never+meaning
    • 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_off0000c405.bin
c9964ec6bbf85fb9045d9e68e59ac2e2e5797abcb7d995b4c17da94a2b26a11f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC405 16328 bytes
font_01_sfnt_off0000ed94.bin
f10625658acaa4093272afb3f0bc0a3992d5daa774aa754e1cfc268fd59f3054
pdf-font-stream PDF embedded font (sfnt) at offset 0xED94 10124 bytes
font_02_sfnt_off0001041c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1041C 16792 bytes