Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc45879267d2715…

MALICIOUS

PDF

100.6 KB Created: 2021-06-21 12:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 36debb94318300c11d74d0a5a9615c8c SHA-1: b8b202942e5b2f06f559a615e613945fda305b16 SHA-256: afc45879267d2715d7fea01317b6598fc47bd6180e42a27fcdb94fd5ad97467d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. The document body is heavily obfuscated and unreadable, but the presence of multiple compromised upload URLs indicates a likely attempt to host and distribute malicious files or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/d51def851c4d42fab07d92377bf07b77/60491416921.pdf In PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/pqse7o9mrnhvr3hts27jc1p8cd/54123018013.pdfIn PDF document text
    • https://stvorki.ru/files/file/bujuruwefuropot.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/5505472954.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/99380667447.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771cd376c41---puxugodarojeve.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078d8a23eb5c---ratovagunijojir.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/6ac12a0fbec8387f3fc00a5bd002c6f0/fegelugusiluxivavadufagas.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/02rupgotdj932hnikokjp78pf9/xerunorurinebezobo.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/8945300baa4cac8a24af58192ba2e252/17570243026.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/0a16e8834ad28f317f69a5916be95b53/fiviwatuge.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/jikupatotonapodupute.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/717d2120f886325fc2b097cb8d1777ea/gabunokuxovijiwo.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/nirotumezogada.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ooa1a9878pvm37nnoglkdjq7q2/36431542060.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/dc9ae92b73636630d703947009b3a6e1/55342321380.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.thdl.org/http://www.thdl.org/TibetanIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=baal+veer+returns+websitePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlTibetanIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000ce09.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCE09 13248 bytes
SHA-256: c9ab5647519393695aa1605de4bcc79e488e680ffabaa51e163ec1ccf41ad009
font_01_sfnt_off0000f308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF308 3756 bytes
SHA-256: b0705f480e17b64455e6e5568cb6c73a53943904780bd48867066c6d97efd6a2
font_02_sfnt_off00010073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10073 5020 bytes
SHA-256: a255b0a59840010b04e8ecca1fc2f3dee9ac8fda1bb21acc5463b74feccf77d4
font_03_sfnt_off000111ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AD 8736 bytes
SHA-256: ef0a6184ab7903017ff959cf19068075ddba9fd48587afa1155fc2941463be1f
font_04_sfnt_off000122c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C5 4672 bytes
SHA-256: beaf4c296c58521287823dcc25e583323d56740a008721e9bc6e827d804cd759
font_05_sfnt_off00012f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4A 13168 bytes
SHA-256: ce89ee91959186355185e9d224d591211c163aa30021b2ef3a81bb61703ba514
font_06_sfnt_off000159a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159A6 16504 bytes
SHA-256: c2cf89b341cc615d3234b69d55a59dc7ea146ca4e67e0695c14f27c3795b1b1c
font_07_sfnt_off0001705c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1705C 6216 bytes
SHA-256: a7b54611db346a64dd73c3b0b4067458cb7f60cae9134ada9c8ad2d91e9afe99

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