Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec61bf971a6dbb8…

MALICIOUS

PDF

89.0 KB Created: 2021-06-28 01:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 175663e303a0ae8604aad52eb5d157c3 SHA-1: 3ac64d13372c713915e58955aacac30b9da97885 SHA-256: 8ec61bf971a6dbb839014144c9eb3988b2bd9b7c7d74a530a890458c75b1047c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://archism.ru/uplcv?utm_term=table+etiquette+cutlery
    • https://ovalpolycoats.com/media/gonakazazizuwuxinasof.pdf
    • http://bociany.sk/media/file/mijomerowodev.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/e621eced631a0de70e0670b3030e32b7/92172003962.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/57885d19ad870cd6e63dd6a0f812ad5f/fovogif.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608726de9855b---77596359042.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160941ed49c9e3---7611728827.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829a805db00---jevojovuzuli.pdf
    • https://sedefartphotography.com/resimler/files/64827451746.pdf
    • https://pjkconstruction.ca/images/file/zalorejataxokerukipatoge.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87dba4ea00---66623636831.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8e0192f25---4030729272.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f528bcde3e---27833963337.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b90d516c8bf---47975663124.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3d260a029fa7ac028b50b088edec8bf9/29035202473.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/rhgje6l3qcbg66sfilnbsp7k90/88770791482.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/b3a1924d428946e63f1fbbab484e4126/pagimolidufuxuxixipoviz.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/72d643d2a2daacac4710bbe324ad9997/49559477343.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609515e8bee97---gixod.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608519ca81396---rizewozosiragakomokejorej.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb2270c8dc---82583026592.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c26b60c4c00---dodurotitulapekoxenidebi.pdf
    • https://marjoyunlar.com/calisma2/files/uploads/36283585888.pdf
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4916932547.pdf
    • 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_off0000ef1d.bin
846601b1129781120dfdbdcf2f529ee8708dfc4afa0b995801c2c4b8f9429ba6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1D 27972 bytes
font_01_sfnt_off00012786.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12786 16792 bytes
font_02_sfnt_off00013f9d.bin
2541c4d5edc88dc80d0e97b05c721533d59900176bd73f9fd256ac07066610af
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F9D 10296 bytes