Malicious PDF — malware analysis report

Static analysis result for SHA-256 0430662d89e6115b…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 23:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 075a9540e3d16ea41b3f53f9a3e9d525 SHA-1: a6451c9796c780f7cbfcffbd6b8940d966075598 SHA-256: 0430662d89e6115b57a5fa27250fc0b101ea77eda515c94a7be273202ec2f50b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised WordPress sites. The presence of multiple PDF link farm heuristics suggests an attempt to distribute malicious content or phish users through a network of redirecting links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://fizjolech.pl/userfiles/file/3602304063.pdf
    • https://dubaimotorcycletours.com/uploaded_images/files/81208254484.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9b63be960---56480552556.pdf
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/pebetotarudewewoxetepa.pdf
    • http://autowagon.it/userfiles/files/97974736412.pdf
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210909225848.pdf
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/65117266752.pdf
    • http://avvocatogiuliani.it/userfiles/files/vujasuba.pdf
    • http://farmaciafasolis.eu/userfiles/files/zijamevibomupetaxemiz.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403ab94e0a4---86176704100.pdf
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/lofifuzerig.pdf
    • https://rajakeempat.com/contents/files/56644786074.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16139175f866ac---lopevoxufetovodotisuzitaw.pdf
    • https://sts-cct.com/app/webroot/userfiles/files/34296571148.pdf
    • http://vibrator4you.cz/UserFiles/File/wufaburili.pdf
    • http://dokumsuzgec.com/userfiles/files/jobulugusi.pdf
    • https://signika.pl/Upload/file/82961622656.pdf
    • http://cozycornerexpress.com/uploads/files/77420690778.pdf
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/51526205232.pdf
    • https://theurbanthinktank.com/files/41436076127.pdf
    • https://sitycare.com/FCK-UserFiles/files/30229573325.pdf
    • https://hobbypet.cz/files/file/witipadurulosasifusovedig.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161463c4aa5cbc---11213494224.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=truck+simulator+2015+mod+apk
    • 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_off0000cbf0.bin
0d3571e48a802c5321904a448c5e8d55625eae1dc5806cca49aae5186d748ade
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF0 11024 bytes
font_01_sfnt_off0000e5bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BF 16792 bytes
font_02_sfnt_off0000fdd1.bin
d3c87663569332462a373a79a742733c7982b1a0bdc82ef2b32b26bca98a3168
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD1 20568 bytes