Malicious PDF — malware analysis report

Static analysis result for SHA-256 f44ed738b0edd624…

MALICIOUS

PDF

87.6 KB Created: 2021-07-03 13:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e18a43f929c0c760d018d96f5cc610d SHA-1: ae71c31959f6d764b3a47288a0a63f9544dbc238 SHA-256: f44ed738b0edd6246cace1da2d943a1c7f3435a7cde262b74027f0e1a7e7099b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to exploit user interaction via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://apogeeconsultancy.com/upload/files/91499282992.pdf
    • https://pcstaiwan.com/ckfinder/userfiles/files/gilotajogekujax.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160989398ccfb8---64675421054.pdf
    • https://prtl.pl/userfiles/file/44575326600.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/be561e7fa4cdb357f70d2d053b5fa6ae/lijopekuwilosixukejefuwe.pdf
    • http://superpart.com/files/siwasimexebog.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/96mo5eirljgp67e1p9uvrifug7/xujizuxowipodinixirasa.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160836e594f18e---13664462671.pdf
    • http://geniuschulatutor.com/userfiles/files/vukudeduzepoletepe.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/hee9nb9u083q334cjdqcbnundr/11365859391.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160867fbd15644---70383818196.pdf
    • https://bedandbreakfastchia.it/userfiles/file/rabodexamejosoxudapara.pdf
    • https://childrencareandliteracysociety.org/userfiles/files/silifamufu.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e90a4d2e1---topibuserefifiketejar.pdf
    • https://xn--fct8ml6mwue.tw/uploads/files/20471429833.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a5c487b46---84496778343.pdf
    • http://lahma.pl/_u/userfiles/file/runabaluxejelazijema.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/859046eb99cfdf0fbde0675472541176/83483267144.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bbeaa62f0---93744262651.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b41f1dbc7f---37582542054.pdf
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/16645697302.pdf
    • http://inistor.com/ufiles/files/48262393135.pdf
    • http://hpc1970reunion.com/clients/3/3e/3eb4c5728feca7eb79feed4eed44c519/File/68545563020.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=a+house+divided+lincoln
    • 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_off0000f848.bin
7dd2b04e03bdc1a08093d33fb8859496c0df98eafb3ccfdda0173c58be473684
pdf-font-stream PDF embedded font (sfnt) at offset 0xF848 16392 bytes
font_01_sfnt_off00012242.bin
06e24a8466e9fc4574a0db178901cef648154ae18aa28277b968a4702a83b4b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12242 10256 bytes
font_02_sfnt_off00013944.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13944 16792 bytes