Malicious PDF — malware analysis report

Static analysis result for SHA-256 67861c95aeb6ceb6…

MALICIOUS

PDF

100.5 KB Created: 2021-08-12 02:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e4884e75ffff63ba31a1776ab93bd61c SHA-1: 9770305750dc336e7a3bde227533f5b5e9d2e82b SHA-256: 67861c95aeb6ceb60a079cfbf06e3186cb329e64cf06a60f84cdc6e37014c691
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://drafthe.ru/uplcv?utm_term=allied+hydraulic+floor+jack+rebuild+kit PDF link annotation
    • http://mhs69indians.com/clients/864804/File/pazebi.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/94423431785.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3aa5c374cc---wagadopolawerizo.pdfIn PDF document text
    • https://123natura.com/stockages/files/bakigudanafev.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8fff1871c---51709502459.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f697835390---84950917491.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/65799529391.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b12eb860e48---54415136318.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749ab1b98ab---wokuwuxonuzovufuguvosi.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/55aebf5382600c55b41a362a4f115c31/rimetu.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/durimata.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/rerupivuxewedixa.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/f73bd61ba35dbf592b26aa2b33cb5937/44261922001.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/buzuxolikusopesilo.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/zujajekanuj.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/67775117832.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/61148033541.pdfIn PDF document text
    • http://ahchala.com/img/file/naperetemenetidik.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/34782465831.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/98721080423.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/57234160974.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2eaaec60a6---89027341877.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/98481382880.pdfIn PDF document text
    • https://invest.pl/userfiles/file/vogafinudelawozu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000121c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C3 10856 bytes
SHA-256: da3ae01550235c72f7b96752ff9880886ea7ce247d038ac7c8597c00b1c4fcf3
font_01_sfnt_off00013afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AFC 18524 bytes
SHA-256: a6ee48f05754f12f4365e93fcb74f90814b8b13b87ef1084daa17b31e6768703
font_02_sfnt_off00016b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1