Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9186411500cf29c…

MALICIOUS

PDF

90.3 KB Created: 2021-07-03 01:35:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d185bdd40e37f541d339d759f275be5d SHA-1: adf87f75a79034cbf9eb19db0abdc4bb2045da1e SHA-256: f9186411500cf29c605c4e1dfdbd5120026ce543a53908d485dae015c188ea77
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/stvvcjfch2ndj48g4an7aqqad3/zeriwokegalujo.pdf
    • http://seritour.com/rsm/files/44963540026.pdf
    • https://coevent.ru/upload/files/tixanizakulutatomut.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/d8d75849c7627934d2ec4f7c6e828964/53692505598.pdf
    • http://pobierzplik.pl/uploads/files/87552679949.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/co8c4g7sjgjplh559ta8076inb/42111071594.pdf
    • https://vatlieutaphu.com/upload/files/rujimej.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/e9flfqc1i9g3v2635j4b7od0r4/fijojipazowalabokijanedu.pdf
    • https://noithatkuongthinh.com/uploads/files/pakowigawifexijiwifurulet.pdf
    • http://aurora-c.jp/files/files/dorovegul.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/rngs76gck82fmpv4ht8alck4st/65693417916.pdf
    • http://thermogroup.ru/uploads/files/pubidufetogikomatib.pdf
    • http://ersatzmonitor.de/userfiles/file/21393553134.pdf
    • http://sixtyguildersresearch.com/admin/photos/file/80559887220.pdf
    • http://china-hold.com/UploadFile/file/20210608132552910.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a47fa58475---mesexomadotuwifemug.pdf
    • http://animationcoach.com/userfiles/file/lawupilidekejuju.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9fb30559f---65648679416.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982896194ed---24481360644.pdf
    • https://solener.info/ckfinder/userfiles/files/25033431130.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160834b4a02d1f---gafolatasiwenomizelaref.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/3nde1d3ekqoothf8ce2to9lsma/pekibavu.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/hcoig1cs2dnd2qr4gha1uajlsc/99772392858.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160906c82c373e---2726885759.pdf
    • http://yuanyoujie.vip/userfiles/file/sedakolu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=carrier+example+biology
    • 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_off0000fe3b.bin
066ad01749e1adfce04e21e61181f9caf5ced75b0a01f5e1999a2a0a994e879a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3B 17348 bytes
font_01_sfnt_off00012bea.bin
482b63d18bc477444ba5073079aebe5efe735f0bca65f30199abc51a41b6ead5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEA 10612 bytes
font_02_sfnt_off000143f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x143F0 16792 bytes