Malicious PDF — malware analysis report

Static analysis result for SHA-256 44dbd93f1539f7da…

MALICIOUS

PDF

82.1 KB Created: 2021-07-02 10:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 21b518d355e218511edb3a80733da937 SHA-1: a5d33137db70d9a7296500b8b591ad5afed48598 SHA-256: 44dbd93f1539f7daf22d1e52de580ac6efda4729b2e8de9a15fbf351434e5a0a
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and ClamAV as malicious, indicating a phishing or malware distribution attempt. The sample contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's intended to exploit vulnerabilities or trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aawyx.com/sites/default/imageuser/file/42831145331.pdf In PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/oudbb3aj6b2jufbgm7njtpl4n2/25341448331.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/g21mfvmm5rsabesipevoi7dcvu/14431416028.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160cdfa821e6bc---1468997157.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b05005971---24892597073.pdfIn PDF document text
    • http://beiks.info/public/file/gogugadowojawizukepapixam.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/basafanaseremipanope.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/xararixofidor.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/xojokoziworiwizulomirire.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/53947806295.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8d4e2a74f---zivopamuxuzekoz.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bae196d1bb---paludesefazu.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2121ed03dd---18950499464.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c5e481eb6---17835533666.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/27189316969.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/vj32tlvi3heh14emal3vmeno46/lomevepagovepekalububojik.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/61bc647588809bd977165007984b3b6b/genutudalesuju.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/lopudu.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/27013673699.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3873a837b6---tejosunog.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/85777458231.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/2085d1c803e2e0173c9e8f37d4db1a15/namokozejajazom.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/c1i3uq64imcd9rn1uraa3aobjf/kigiwuzezuxosafulezup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=hl+stock+price+today+per+sharePDF link annotation
    • 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_off0000d8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF102 10704 bytes
SHA-256: 782c9ae8882476b17f2a13d3b2839c023f5e7df1be5bb927b713dfa1361afdec
font_02_sfnt_off000109b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B9 18172 bytes
SHA-256: bb7206462dbeabaf7c01837b977682e7b41e9f6d0de1a45017ab1e916cad3ee2

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