Malicious PDF — malware analysis report

Static analysis result for SHA-256 af59432e328dd730…

MALICIOUS

PDF

83.7 KB Created: 2021-07-09 19:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 57d0a4a12cf61a96a0a39d7391ed0c08 SHA-1: 456b65d49dd3fd5b4085a7e21ec17fcdef21c805 SHA-256: af59432e328dd7303aeeacbed502de2de3b1af2d56f82989b0110480368d4364
156 Risk Score

Malware Insights

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

The file is a PDF that contains a large number of links, many of which point to compromised WordPress sites. These links are likely intended to lure users to phishing pages or download further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/29fda3df3a7191343d101df6fa42d52a/96644255105.pdf In PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/125d56ef1d2ad401c09f593ef96705d7/78036571795.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16072c8cc9a852---papoxatawalazipu.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33914072ef---sakexepabanosileki.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/dobibogezokale.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b5c7665e3d2---gewagune.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/5040c19ff094a645531a1fda04da3ee4/85057106544.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/32134346068.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1249d3a4e12f807cb53f99762df99a6a/83323521655.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/nozopo.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/37490258670.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160703fec41714---bemorelameponek.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/94590594500.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/ebce3d405333c57dd8de1b0a69b9cde1/14453749588.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084054c81c8f---xetegutokaxeteg.pdfIn PDF document text
    • https://placute-frana-dispaco.ro/userfiles/file/sowaz.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a24221c287---51743522049.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/xirazuxokeviloreduvovut.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/kesala.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/84243910745.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/60cfab91e3741.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/toluwogonosusapenig.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/vitupisajijeg.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa719ed317f---50260930744.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=intune+kiosk+mode+androidPDF 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_off0000e5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B0 10504 bytes
SHA-256: 264a580afdb7b27ea46f9beb7a8ee1ce54c3343d1fdabf0aa170b21d0a26247f
font_01_sfnt_off0000fd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD98 16896 bytes
SHA-256: 01423bdcc028ba4132c59e9f6e365ef7019509489c1f8e9bef13e4ee00e071be
font_02_sfnt_off00012942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12942 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1