Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc2f0fe0f73eb6a…

MALICIOUS

PDF

100.8 KB Created: 2021-07-10 08:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34227d75a0e7e005f97cf4213a55f272 SHA-1: 14f7d9ce4d7bddc2202a921e5a895f15218c9cf5 SHA-256: 8dc2f0fe0f73eb6aa6f0a74f46595c4704df2bb91f8b8fe3904bfb6ca99ed913
164 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, many of which host further PDF files. Heuristics indicate a link farm on disposable hosting and a visual download button lure, suggesting an attempt to trick users into downloading malicious content. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adad2965c1---sizazu.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160aaec39cceb7---jitidonufatidulisiziz.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/ea84f43ef1c3d50b80c467536b568806/48373602411.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16083d2e6593ec---volutexumamusebobavoda.pdf
    • https://rijst.nu/userfiles/file/fidusififomaxaguwapixugo.pdf
    • https://bbpartner.cz/userfiles/file/9863474212.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d243b51076---1205004915.pdf
    • https://tavio.ru/files/file/82347849094.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/a843ce110e122cc7a9de6ce01c86a502/xepasedat.pdf
    • https://yuss.it/file/jifibubodidedipatuwara.pdf
    • http://ifa-astrologie.de/userfiles/file/78892432611.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/ub6ksjktkg47hrqadnls9h4kjp/79397447453.pdf
    • http://wami.cc/data/files/88298717245.pdf
    • http://watthaistuttgart.de/userfiles/file/95487095339.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/2o1g0hd0k3k3fdtgemn6totoab/22237046786.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1fffe90c6---suwofuniz.pdf
    • https://familienbilstrup.dk/ckfinder/userfiles/files/tegekixurawirunev.pdf
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/jubamufiwejozunad.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/866a5a9634380be8603882a7f762e32e/vixiditekufexu.pdf
    • http://mobydick-band.de/fckdata/file/51020296168.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18062f6a3---vutixasideluz.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/da07a1d60f0360c48e94f22f70ef0b5d/nunopu.pdf
    • http://www.dismaplant.com/ckfinder/userfiles/files/popebisezawodusuzemegupu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=problem+solving+competency+example+answers
    • 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_off0001273b.bin
f339b9659b23cf02c02ffe2b9ae70612a82f9e01cc5609226dc75eb59d1a30dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1273B 11224 bytes
font_01_sfnt_off00014167.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14167 16792 bytes
font_02_sfnt_off00015979.bin
95c9f1569b266e3d47c734aeb1e47abc0c199bdac9777b65423bf4f6711fb738
pdf-font-stream PDF embedded font (sfnt) at offset 0x15979 17000 bytes