Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef13af42002fe6af…

MALICIOUS

PDF

76.1 KB Created: 2021-09-05 23:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4678ce62ad98591d3ef24dae2af59864 SHA-1: ab1efa6d8986424a2939e21520faf66daf953ce3 SHA-256: ef13af42002fe6afed07c15b8b904b48d0876f25d3266a6047b6b591220e98cb
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous external URIs, including a link farm on disposable hosting and links pointing to compromised WordPress uploads, suggesting an attempt to redirect users to malicious sites. The presence of PDF-specific heuristics indicates it's designed to exploit PDF viewers, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://crewmak.ru/uplcv?utm_term=dragon+ball+multiverse+manga+pdf+download PDF link annotation
    • https://nestuby.com/userfiles/file/77103334391.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/gutag.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/7ec3b3714cbc78598288fc20866713d1/63356459217.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/xaxupugujope.pdfIn PDF document text
    • https://questyme.com/userfiles/file/wikazebobok.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/f4a06225b8ffc6765d8bc1e79ff29029/12185276232.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/o681afhi3cukdssdgc7e2npngh/4284457933.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e36e273185---39082769943.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/zomubegi.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/44232468328.pdfIn PDF document text
    • http://teplospectr.ru/images/files/71988643651.pdfIn PDF document text
    • http://chouchouphuquoc.net/upload/ck/files/rotedo.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/69973362488.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/33166249130.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fabogimexifivopemexape.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/38033912065.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/10375531234.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/lozoket.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/gowapadigakalubebesiti.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/xogonu.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210622174550.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/bomorevejer.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2050cd2538---45494045340.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa4e0b94c7e---kilisusosole.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_off0000bf8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A1 11232 bytes
SHA-256: ce5feb0d02208b59c8977932b4bdb67b30a60907dc58976fc1d2649dc9186649
font_02_sfnt_off0000f196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF196 18648 bytes
SHA-256: f8307f718f8f532be4f527772c16d9ff3fb2510be4d3ed3c9925a2eb58f966a7

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