Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d1a0744af26a3ed…

MALICIOUS

PDF

90.8 KB Created: 2021-06-29 00:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b8c604269d41eea5a8c491698f06083d SHA-1: 1884e8446f8436d1c65993a57bb5bd24887b3ec3 SHA-256: 1d1a0744af26a3ed6f094bf3e4899811a35717023e1d66b3883f06a55a9c57a3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, specifically targeting form upload directories, likely to host malicious PDF payloads. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to facilitate the download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd15cde938---78923369499.pdf
    • https://golf-tout-terrain.com/publish/page/file/36321473495.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bbd172653---zawerakexawapezu.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/1b5f527b14a4047174930e25ef05d1db/komegumijunufekofufuxik.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/s5rahp99pmaklqp3sk3qe23m45/41820453901.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/966716e249c34c427bd5b335d0ca1598/sopamikaw.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b9ea9b176---47965112169.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c58b0d572---takafa.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160946d6387d49---13518840360.pdf
    • http://abwplazaview.com/uploads/files/fofoxakomudaxoj.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/e19e6471d954897b0b6b27dbc645bd5c/29184978885.pdf
    • http://allycatering.com/userfiles/68241493751.pdf
    • http://dush-kz.ru/uploads/fck/file/vilegoxo.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/90f8ade03ac62fca8935ce324f8dba5c/36062198622.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a60a1a8f0f---34838819166.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/bcee8a78236b617d81fb852055448d47/47483722158.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/1c20026215403bc396d803aac7a4f70f/potetureg.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/co4qj3lo8oa1np22la86c37b7d/gibezerijelazezaj.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160995d863a52f---43774313934.pdf
    • https://uleiuri.ro/userfiles/file/jafuridawivow.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e47a880fb---bizizi.pdf
    • http://urparitet.ru/admin/ckfinder/userfiles/files/69077180425.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e9f796e0d---vafabakopoz.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3ce523a5c340d51f0482d5c88bf9eab9/vajidubefa.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/50c8f23b7316be56070cfa8709fe16ce/rizaxutedepusuxaj.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/seha7ct5c4r8c9p7cd4q0arttq/zizilefutuzibutugokawalap.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=the+haversian+canal+is+the+site+of
    • 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_off0001003c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1003C 16792 bytes
font_01_sfnt_off00011853.bin
3c6b1a9e67e5e8c51327c2bfdf45d0a1daedc08d0d3415293b57a3de673690c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11853 10464 bytes
font_02_sfnt_off00013011.bin
780d0bb52459f5c922f6db04113ae006cbf945766d31f6a17bfa466dfc696052		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13011 17432 bytes

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