Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a26d1c5674ee267…

MALICIOUS

PDF

81.8 KB Created: 2021-09-01 02:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8f0d88a5cb2b66f6e52d4d1aaa05d4a4 SHA-1: dcdb3d6c1bdda45b0a593712dabeb230286c91f6 SHA-256: 1a26d1c5674ee267f941d5403a9eccae55127c7ccad1992ee8a05e5d4277f5f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the links and the detection indicate a probable phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://krisoc.ru/uplcv?utm_term=impressionism+and+expressionism+similarities PDF link annotation
    • https://psychologgia.pl/Upload/file/28855728816.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/3iv6dm35qv105tk9b85asu5r23/32953028360.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/24547819112.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/vapenef.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120da54dbcfe---53901197840.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/22247626117.pdfIn PDF document text
    • http://haverfordhigh77.com/clients/e/e7/e7c5a96ea35a64a1345a575153f12e7e/File/kazenisokatomuvolod.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/basosaxotijazakuba.pdfIn PDF document text
    • http://innotack.com/userfiles/files/vonuwatulez.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/51451063331.pdfIn PDF document text
    • http://tauzetaques.com/clients/1/1b/1b95303171b4519794d6fee637ef680e/File/vezufixetavavorilew.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/72717435214.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160857e947a074---9449542335.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612270569fba1---49927982435.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/sezamizoxukas.pdfIn PDF document text
    • http://smith-williamssisters.com/clients/d/dd/dd6cbc7353a6ef31c13ccaa63ab862ac/File/xutujos.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/lewijunekebujimopusikofaz.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/upem0s4agksosncijq0lon5p6t/39425163513.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3c8512be3---delotuzenijilivubosil.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/pgd9hk9vb6hh1hsntl28kpto1v/nanexazepu.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/52814662965.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/3efd12f751ea494e3271275650ba3cf0/26187543466.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16089d0afb6cad---nitokivisujen.pdfIn PDF document text
    • 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_off0000dd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3B 10608 bytes
SHA-256: 3f59779cb59feb7ef46dff1c1002fdf4cd527c60108f70be02595fac4497d9be
font_01_sfnt_off0000f56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7D 17032 bytes
SHA-256: b502a1c01843772111a9159bc15f97dec555962a453753706c9c4a10f78021da

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