Malicious PDF — malware analysis report

Static analysis result for SHA-256 a63c36e470c01375…

MALICIOUS

PDF

77.3 KB Created: 2021-05-09 04:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 975be4acc48efd38a9810a7d1379ea46 SHA-1: fa296919a29d4fd01038758c53d49a8e14cbfd31 SHA-256: a63c36e470c01375d360b63d183384f776dff511865f7b479d35247115dc4b1a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content. The document body is obfuscated and contains metadata suggesting it was generated by wkhtmltopdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160925fb026433---72799547372.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/b6bb1494dcf65d45ebb9af3c964c0df1/8211473235.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a437d0296e---gifumanoxumedizodig.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/56a64ec8f8d0ed519ef5a2a38f89924c/tomijonibafilaniro.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/75043ca95b64d6f141d71065951a6c69/46301973986.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/a363d92f842f6d1647b2677af8ee154a/20077292829.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f94ca44b.pdf
    • https://hondamienbac.vn/userfiles/file/58527549957.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16081a912cbbce---34110575292.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081f3d4b9ea9---49549268574.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/4q46ttnmhplm8qc6v0feer92pl/devotedemexidif.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/4ce435355ed41a6084ef0f8a75a8ba0e/nizurixeluferagikinota.pdf
    • http://metabolit-plus.ru/files/file/nezurevomase.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e1e7112690---tamokofifixalazulesokamew.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609711d310382---ruxijanevemikafiduxedosoj.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/pajexunajuwarawab.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712356a970a---14203520973.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6ebf8eb6e---berapigiwor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=cg+jas+geet+hd+video+song
    • 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://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d053.bin
2a8417b321489c7a29426f25f180d58ef1f0cc768dd5e33e014f1f8ce2d60677
pdf-font-stream PDF embedded font (sfnt) at offset 0xD053 5000 bytes
font_01_sfnt_off0000e15f.bin
5c765123040d6c37cde1eb15a8d3db18938b4494612c1bdf3c06f7890f64cbd9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE15F 11208 bytes
font_02_sfnt_off0001080f.bin
12198ed304d8e74df64bcaa8a4aae6da6436d73ceeb6d758e01031f89a18fcfe
pdf-font-stream PDF embedded font (sfnt) at offset 0x1080F 16076 bytes
font_03_sfnt_off00011cf5.bin
ad896a795a2dca666a77b6a1e271b0bce930f85dd2134fa1998f49ed01e6a825
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF5 3000 bytes