Malicious PDF — malware analysis report

Static analysis result for SHA-256 44d1811266b67ba2…

MALICIOUS

PDF

93.7 KB Created: 2021-07-08 19:16:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7ab873aed77c939894fe6b8b2890a653 SHA-1: 98365b71535a5ddbed3a2dd9d601b6e236799113 SHA-256: 44d1811266b67ba2049f24ea2bdeb6180d6d05566367d9a599b3b1b7b5fe57e6
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d037477cb---87155983322.pdf In PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/46838886862.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/63845441192.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/75272f0ea3076bc502e9df79be1c903b/14721422012.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210517175627.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/46f7d6e13e1fa85b06caad8be89a655b/kuxifowaruxeberufazuvilun.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16083979079399---nezaxujoxitinitagowuzisu.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcc847ef4f---94823066752.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2efd23e06d---wexafalevim.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/f28b4b041e7dabf79c438fbc8e13ee87/jezizuka.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/a3e2a151cae5ea0645a3e9a90a92c582/sufefox.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210629/file/wejometozuzudu.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/7d22eed6d52b64d29982e11a5995047d/vunigazowam.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/sumakawupadejumitagok.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/dc35d7d185bd290fd036bba7be25d51e/funefivarutifa.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/47363808336.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/oiuu54pgdvp5r5eg5pj0pntpor/taroruwajok.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/pmlkj1745akbh0jfjpoq5taf4c/dijivawenanewewokadem.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1607b85b643d45---763355003.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/80881456359.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/1fcc0afb319d99996f4705022542c624/pizorojuxomex.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/47412614326.pdfIn PDF document text
    • https://best-label.com/upload/files/9384938802.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/94181789559.pdfIn PDF document text
    • https://actor-conseil.com/files/file/niwuvawewefagiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=just+2+words+1036PDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAF 1848 bytes
SHA-256: c4dc6f9a617d38916bca7fd1a7eff04d8e37c392cffb72ec66fee4973746617d
font_01_sfnt_off0000f443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF443 17696 bytes
SHA-256: 4c04b3e6e5405d0a1770f76b9f8ffc867e609eb0ece41687c3b06f4eb7268425
font_02_sfnt_off00012239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12239 16240 bytes
SHA-256: b893704bb312f64a4dfabb018549800e08c59d7964d1c4f20f088bf46d3ef204
font_03_sfnt_off00013827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13827 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001503e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1503E 10516 bytes
SHA-256: 15a33cef5ddf34cec3ba82dc18a59b421994889ca959f5c4a9e5ce8772b4dcd0

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