Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b085e37f6d4e61a…

MALICIOUS

PDF

95.0 KB Created: 2021-07-29 21:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: efff52311fd4e770c910e816c7d776ca SHA-1: d95074a328c13dc17dd6aca17bcdbec9978f055c SHA-256: 5b085e37f6d4e61a9a83ec791c927fc14c44eff84fe1bf62e5a3f891dce3a9b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites. The primary purpose appears to be redirecting users to potentially malicious or phishing content hosted on these compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9731

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://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffae39793f---958412330.pdf In PDF document text
    • http://atek-ent.com/upload/file/baxebidusufumozofoxisagu.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b204545aa50---lisugif.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/3fjgkeakoidsuh36uvu6aaf0o2/18099749127.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/jagemexurimemaro.pdfIn PDF document text
    • http://kezmosas.hu/files/file/nijagofomam.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/3acf5a2d679abb6def613308554f0b69/10845740445.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210713041420.pdfIn PDF document text
    • http://apcmagon.com/userfiles/19533240278.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/nakepegilixujitikawuzi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c8d52f7f4---36694250946.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/82378540957.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/pvce89viv6cgpb9nuuu9832ob1/14851131366.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/ca4e5f4cf14a3993675dd68c02416c87/latopo.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160984ba3a8f71---vudaxekofafib.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16084d5661fa3d---sinukanidofikugijigogoxer.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/dubufatevixujesop.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/4443969804.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/olin2tb6ufoca37m1rhs4662v6/sividizuxawig.pdfIn PDF document text
    • https://aedwea.com/upload/foto/pofowititufowub.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/texebasabovanit.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/48115253092.pdfIn PDF document text
    • https://senhewood.com/d/files/76912078956.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a642a2063f7---josodepobujinalasuxepin.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/acb594e72fd1ccdbe41aa23e98bf3060/92327928067.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607217e02ca8d---kisavifisinesexofe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=logic+of+subchapter+k+pdfPDF 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79D 16192 bytes
SHA-256: 1043c34f7c1d2e524d166459504b0567058776f4c1edd1758dac1e35b27d6db3
font_02_sfnt_off0000fd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD56 16916 bytes
SHA-256: 3b7a0f66785924d93d1982ff9b71acf80f1bab568fdd720c032f87e27299bc98
font_03_sfnt_off00012978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12978 11036 bytes
SHA-256: bb0d4d0f0afbdf40d294c695b87ed98f5f373b9be2b19df3e69c03848355291c
font_04_sfnt_off000142eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142EB 13184 bytes
SHA-256: 1ec8cdf3b389ccf370e4ce393a0da79c265d06b672cbecfabd87a647c63f3b6f

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