Malicious PDF — malware analysis report

Static analysis result for SHA-256 171cfa5b79a28cc5…

MALICIOUS

PDF

91.2 KB Created: 2021-08-01 04:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1a41f274748934fcc6752b4416117106 SHA-1: aa59abf3dfbee81300398470240ebfcab4a46cf3 SHA-256: 171cfa5b79a28cc5279c8b0c6902b36927f094a9f93790451db6f448b4a7e45b
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories and other domains, suggesting it functions as a link farm to distribute malicious content or phish for information. The presence of multiple external URIs and link farm heuristics indicates a clear intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9702

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 http://backkwang.com/userData/board/file/munetasepemozoseko.pdf In PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/32347923070.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/83737427609.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/19430785513.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/doxonefazipo.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cbada3464e2---gomipufuwama.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/93624374295.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/3ebbe9e7d25b0e5e99dbb2a071f419b7/15837686636.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c398614b3---97393501408.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/icqor8q74248g529nv53vqarqc/64955978638.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/vurisi.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/lujizira.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/ee9aea434870a4173e83323ef6cea9da/bodufolutopadar.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/14143976599.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210707_234306.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e21dce766a0---sepilomu.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/92333535507.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/b611a7f0fb4e683646672cafb93d779a/9265341742.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/989ee2f0b0edf1614827ce3f7a7401c7/gezewifasu.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/49988455978.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0d72ac9d54e2e0727aeeb46b95e18311/boguvimesomavod.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822d2b7118b---kevenedetolene.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/vu355s4pdlbssr05h3momr62j8/jerizewogewo.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982193f31be---18235524635.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/e825ed2950337d3e60d603f65c674e05/93122159252.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfd00a0055---wojebunajol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=office+para+windows+7+ultimate+32+bitsPDF 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_off0000cceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEB 23560 bytes
SHA-256: 93585a99136737dfcdff22b7e396a1e4d90f7277feacc06c24bec9dcc94b204c
font_01_sfnt_off000105a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A8 11472 bytes
SHA-256: bfdaaed3bddd728ccc623f68ab516a2fd6f29b60106c00d14a1eb21bb1f3bfce
font_02_sfnt_off000120c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000138d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D5 16504 bytes
SHA-256: 115b418de671664b2b2389805d710068f6007e4508dd5a97e03637cda0987e5d
font_04_sfnt_off00014fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FC0 3120 bytes
SHA-256: 90cb9574e3f99c7a73481771630a9c73b0eefe6050b72c5704b1a8bfc26c184d

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