Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f6b025e382ad7c…

MALICIOUS

PDF

67.9 KB Created: 2021-09-25 13:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7aea4484dcc0523e8450020421ab2be2 SHA-1: 13d9e25e0568a2cbcc1c2c7ac2d1aa5d3a2645d2 SHA-256: 86f6b025e382ad7c8fae6c13b8f4c1d6f57658b6d46ba92cd40975b036629691
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs a common phishing tactic by presenting itself as an image-based lure, encouraging users to click through to external URLs. Multiple heuristics indicate this is a link farm hosted on potentially compromised CMS uploads and disposable domains. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to a malicious site for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://helices-evra.com/userfiles/file/26755902116.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346c4c36e75---vemofunomogikixifap.pdf
    • https://shevian.com/images/file/jewun.pdf
    • https://drinkpoint.com/uploads/files/65630591989.pdf
    • http://resurrection-life.net/userfiles/files/velowaxofizerebajug.pdf
    • http://www.nomorcantikjoss.com/file/sanev.pdf
    • http://www.deco-interieure.com/userfiles/file/4256574114.pdf
    • https://francoisdaulte.com/ckfinder/userfiles/files/48853800151.pdf
    • http://com123.vn/uploads/file/24014848633.pdf
    • http://gopherandsquirrelcontrol.com/admin/images/file/71642424146.pdf
    • http://uniquecharacters.com/upload/files/72794910399.pdf
    • http://tractortools.cz/ckfinder/userfiles/files/20973877418.pdf
    • https://elmawadah.com/userfiles/file/tilukoni.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a1a71fb7f---37947955527.pdf
    • http://babyshelter.net/assets/upload/files/88227852830.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3893dfc85---63075535667.pdf
    • http://ip-malkov.ru/uploads/files/22053923475.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16141cf2de6b6b---81699999342.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161496b7a5f35b---kolojujifupuziku.pdf
    • http://woodlandhills.ilovepokebar.com/uploads/files/majazatum.pdf
    • http://tw-echen.com/uploads/files/202109031218345722.pdf
    • https://cs168.tw/upfiles/editor/files/13924154374.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161342d553a081---zanatakajawevuxivuwupas.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/e2be196da58b784ef80d581ff4f62c79/golimesupod.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=potplayer+android+tv
    • 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_off0000af04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF04 16792 bytes
font_01_sfnt_off0000c71b.bin
022341752d15f6be6a4c88d6c0a0efeb649a92d172d8336d64b210d2b495f7f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xC71B 10396 bytes
font_02_sfnt_off0000dec0.bin
5b4bf91e7d33752c408da25245fe048312a8805f881802d2a7f8a92c9bbf47f2
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC0 14200 bytes