Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a088ae3a16e6ad…

MALICIOUS

PDF

82.4 KB Created: 2021-09-04 21:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7cbe28d8e106416668155b103d5c833 SHA-1: 6fb81fa6849f1bf91fbfa3639f2a7da5349af7a2 SHA-256: 85a088ae3a16e6adc201d5bcda8962ade1b36e5ad062485643024cc99881a7ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/papofimazo.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc0bdcee6---padugikogapoloj.pdf
    • http://mobilni-kadernictvi.cz/files/file/visutixej.pdf
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/50600823367.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/16df75fa3810efca5bb6633f09c87552/fazolawexifokofenik.pdf
    • http://www.vandiestbrandstoffen.be/uploads/files/tunalegavoxezojizak.pdf
    • http://anhuicrew.com/upload_fck/file/2021-5-10/20210510185026421020.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611f2f992258e---50050787837.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611256ff86c79---xebuduzotosedomuvutod.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/7f5ed726857459833ff66427ec79bf57/kaxinidewuzegitexax.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/53610a5a44cbe4c758acc60b347e3798/72582539294.pdf
    • https://stbenedikt.ch/userfiles/files/38210837282.pdf
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/49179172029.pdf
    • http://at2apigroup3.com/contents//files/61722199319.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ef69a4716cea1410684a404147745da2/xeveti.pdf
    • https://lamaisonducoeur.ca/upload/editor/file/sitazomofara.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0b1b3c85d---31289221501.pdf
    • http://tatishev.ru/admin/ckfinder/userfiles/files/45655039542.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/ce64b382e9837a1859e685d98654c2f4/bevezotukulumivixiwilik.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6de3234aeb8896ad2b51c76e5570a376/16404167379.pdf
    • http://homeopathyhongkong.org/files/lasogotomod.pdf
    • https://burlingame.com/wysiwygfiles/file/59651887842.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/7c78e7a8eacfd1afbf6ef61fa21fd2a5/loronajanikigumifata.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/26af01ad28bd91900541e1154b3a3070/wimavi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=infection+sepsis+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_off0000e251.bin
f4be4b261fb7b080c88d8c6f5f1de94b22b43ddd39c8d0ac24b985fd41134104
pdf-font-stream PDF embedded font (sfnt) at offset 0xE251 10256 bytes
font_01_sfnt_off0000f97f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF97F 16792 bytes
font_02_sfnt_off00011191.bin
10c1d3dfa269c83d209fe0c3725bafd3ba149116cd63223edb4f797b059f15ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x11191 16508 bytes