Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b97355e80e2e093…

MALICIOUS

PDF

89.6 KB Created: 2021-06-27 07:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc0909d721d895d52b37235fbc854f93 SHA-1: 363c7d55f468be40ecbae61af07febea5172922c SHA-256: 6b97355e80e2e0932fc283a704dbc65864cdf31babf23cb54ece4b59b11e5a7e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous embedded URLs that point to other PDFs hosted on compromised websites. The primary purpose appears to be directing users to malicious content, likely for phishing or further 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://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbc289845f---33355268928.pdf
    • http://frezerovka.by/images/fxeditor/file/jorogunofapepexi.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/1p7lihlv29jmdeeuc8ski4opom/72007211262.pdf
    • https://nestaerospace.com/uploads/file/90042039091.pdf
    • http://buddhavehicle.com/userfiles/file/nuxobejodajilejujape.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3e9835445482836bca5c777df1ff2611/40876324800.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/h7h06b2husdirlc778tj5jb1ri/zalivetubidagizukazag.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ed0e53198---wulisifukivivel.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743b4351d43---vuroterezovukipuribab.pdf
    • https://alice-immo.com/userfiles/file/jamiwamigajaziwemonozekod.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/2afba78e8mpb3o7vmue09qgn16/31238798453.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af96fc1f931---5597222643.pdf
    • https://mollis.rs//files/weroguwewatejamobubili.pdf
    • http://chronicles.ae/userfiles/files/80835494878.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/mcmidhk0fvhmab7nlbnq1722dt/zajijilutozumob.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/babudirinasepitotekutis.pdf
    • https://girilawfirm.com/content_files/files/13335119290.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffa5cd852b---66586566062.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16094013bc76f4---94866689769.pdf
    • https://1877painters.com/FCKeditor/file/masovi.pdf
    • http://sjhrz.com/images/upload/File/puwujipolikavanor.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/22ad0dac196f826f9fe1147fc40f12d1/gaponevebabo.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/topilevojuzamitabuzuz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=newspaper+chase+penguin+readers+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_off0000f81d.bin
187e2613f0eab357682ef736c4d90763910ed8fea8454114a582ddf65bc6ad82
pdf-font-stream PDF embedded font (sfnt) at offset 0xF81D 10796 bytes
font_01_sfnt_off000110ca.bin
601b431923de52dc57b6e19284e97288603c705ab31d7d2cfdd96911e62836e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x110CA 18412 bytes
font_02_sfnt_off0001410b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1410B 16792 bytes