Malicious PDF — malware analysis report

Static analysis result for SHA-256 de42f1a4158d66da…

MALICIOUS

PDF

79.8 KB Created: 2021-09-05 08:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ac2835614c870f1d22bb9d72c797d346 SHA-1: 037d44819037406a78aadca5cbdbe75c22c621a2 SHA-256: de42f1a4158d66da8fde58beb9e098e5584df4976ea4d2d279dc8c2ac76e35b1
164 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farms pointing to potentially compromised websites, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, as these are common tactics for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://huntic.ru/uplcv?utm_term=ias+38+questions+and+answers+pdf PDF link annotation
    • https://toromecanicorodeo.com/files/kimidifexuzeg.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-2/20210502033102559242.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b661fbb5afa---34891854222.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/34303401935.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210808_134859.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library//File/bekodatenat.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/webomirovadewukugezawoz.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/17506957516.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/70877943707.pdfIn PDF document text
    • http://watch62.ru/files/files/81572747013.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1a5d8c62c---nemafisodasomelono.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/refawikajakuvefufoj.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/kisomizerapovoduxafawas.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/its2oehk2nc953d1etilr4udpr/tutagowexufi.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/lotadunovav.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/9c6d57238d006dffde32f0058870b5b3/makef.pdfIn PDF document text
    • http://ubest.ru/images/file/21569551387.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/3d44e1feb39ac704b5851b1ae99a426e/sesefamudumulijib.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/farufibefuvudem.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/90572615707.pdfIn PDF document text
    • http://belst.by/upload/file/17862163114.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611199e8bb45f---zeweworafe.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/kogafinixubusub.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3673e0d31c6ee492a42efc788b80e6dd/wufarareduxirez.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AE 17756 bytes
SHA-256: b2ed7aa62596deb4b1a8e7b7335ff70058613915e6cf42b833883f36eaa649fd
font_02_sfnt_off000117b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B6 11108 bytes
SHA-256: 5d4df19da825fbb58b61ca3f77940b7d6d18d6cd2cdbfe89b5f3e01d43b1d11e

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