Malicious PDF — malware analysis report

Static analysis result for SHA-256 2600b7eb7dfab29e…

MALICIOUS

PDF

89.8 KB Created: 2021-07-31 18:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3df2488b9c2e4a75b764e46555cb98c3 SHA-1: 067678c69dad3f2e33da6e0563baa501b65de83d SHA-256: 2600b7eb7dfab29e1db03b9d0d7d3c74c869ad25c71d603d90fef789fb963a6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of multiple external URIs and a link farm heuristic strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://diphong.com/uploads/35968690331.pdf In PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/4acspitkm0kf9281ql4lqa2ai7/20532508160.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/99416002120.pdfIn PDF document text
    • http://hodori247.com/uploads/files/fezagatasuwobitujiluza.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/kakewa.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/53930896847.pdfIn PDF document text
    • http://www.kammerpop.de/files/file/37030105042.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/62c5b8c93f6be2fced16f5f8b2953c57/ferojerutojepabijusok.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/liralo.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0295e65891---dilamogogudoti.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086a480f1b9c---35026895064.pdfIn PDF document text
    • http://novichiha.ru/pic/file/kanizafalokijawen.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/46221368187.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/287176d47c27c31f8456bfbd7c59facb/95363164637.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/xazelelodavomafar.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/f214b191613bcf3f0d85f13cc87bd8a5/rabetu.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/dad063839ffe552b96aabd1a96a8dd19/viwolilanulejeburerenixeb.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/73201182706.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/4g0io2lvjuolua0qb3up8qf1eo/dimitesupezo.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/jetubagitug.pdfIn PDF document text
    • http://danfilenemd.com/clients/67744/File/vopafubobavekokisive.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e148e4499---95297138297.pdfIn PDF document text
    • https://warungmimpishio2.com/contents//files/vezot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+do+i+label+a+line+in+desmosPDF 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_off0000fc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001142d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142D 17376 bytes
SHA-256: 29f0df982bb9dd03bf062d6cbf4d6eac96d2392a0402cf0e063a8ba33c6d1822
font_02_sfnt_off000141e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E8 10428 bytes
SHA-256: 2f8f0eb4521974c725dba6fb3dba6a77b88f18f98217ed2883847677232227b2

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