Malicious PDF — malware analysis report

Static analysis result for SHA-256 0779569c60d5e38f…

MALICIOUS

PDF

88.9 KB Created: 2021-08-24 23:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a1d0b9913ea725b85c7034e81399ebf SHA-1: a283cb38ac098cb9ad9eac90f59f806a8f9ce015 SHA-256: 0779569c60d5e38fc707b13a5926b4ab2be47e63e856ac54b0c830d91082a862
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded links are indicative of a phishing campaign, likely attempting to redirect users to malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/tr4bg9iei7tu08ik6p5kl3v1u3/xebinaketo.pdf
    • http://hongphuc.vn/userfiles/file/zavodurapasofejuxerebul.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/irpnr6pjloo7e5g35m91jb2f3g/vevapokedananarukinudem.pdf
    • http://gesundimjob.at/images/content/files/92811522906.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085c99e0d31f---36311742056.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/e9cb37dab7476a03a515adc70602b0ed/wobasajomugoxoledigus.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084f64dbd232---ruzezewurebolofavawa.pdf
    • http://toonesk.com/upload/58609083045.pdf
    • http://greatnice.club/updatefiles/file/21221687287.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/529c8ccee58fff447a8254d20a9a4b25/57812513139.pdf
    • https://grafconsulting.pl/Upload/file/26453379973.pdf
    • http://sonsuadogo.org/Images_upload/files/63918634063.pdf
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/zanufidexozudekuxo.pdf
    • http://secureyun.cn/uploadfile/file///2021071923291961.pdf
    • http://nicolalazzarotto.com/userfiles/files/17951186470.pdf
    • http://greenmodels.ru/uploads/files/pojuzabugufe.pdf
    • http://vytvarnyobchod.cz/UserFiles/File/85221645487.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/27c4af53f575be2383125b86725ed224/69456981687.pdf
    • http://illinoislivestock.org/userfiles/file/91036726732.pdf
    • https://botroul.be/uploads/guzozego.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161008773773be---56598064721.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/93d16e896030f0fa24a64f9ffe30306e/newokipid.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1b506b5bbd389075438404fac2596f96/fuwugol.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/l5qv5bonb8b6gohdo4ltef4ols/56613359034.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=self+isolating+in+a+shared+house
    • 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_off0000f805.bin
90908cf6d1dcb6b876074918ae58405d294e34d587fb0bd048bef1f5fe2151e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF805 16828 bytes
font_01_sfnt_off000123df.bin
46c43489c5297b80ad3a138894d2f34dd82642a0ae857588e46d1ad99be9ba4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x123DF 10808 bytes
font_02_sfnt_off00013c7f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7F 16792 bytes