Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0972936ef6b62c0…

MALICIOUS

PDF

95.0 KB Created: 2021-07-03 08:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2d528dfbca401e800a136ee3a602ae9c SHA-1: b44b6603e20d7732cc9ac2615d98f70fb317b44c SHA-256: d0972936ef6b62c0b1d1cd41a98685bf184e0346cddcb25af4f4b7ac6d880d64
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users through multiple compromised websites to ultimately download other PDF files. The presence of numerous links to compromised CMS upload storage suggests a tactic to obscure the true origin and destination of the malicious content.

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://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/k5unhlerpp026egh8q0m3tegk3/2273333448.pdf In PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160765b852441d---90277123993.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16083e4f0ddb63---84071851430.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/hklkltu3tmparetmmkoejhcfg1/penipupimugetalezu.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/fbee760fcfff0ec82ce2edf537ad3e71/88917861876.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/u23m95huqhmlanbfqse8ncdmc3/futidut.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c69a414b43e---87843138716.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8782615b76---67429387087.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/34be86079986f22bd3aaa15639cc6842/29789601606.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f7f738a8b---83356784419.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/be0af2a6f5e1594eb236e889fb3694be/pemewuwemebemewiludexi.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3048222d9---fiwodomatijum.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b64524bee---ramemimajifetajojo.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/77844016690.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c982d308cb---80149796906.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/22349754350.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/59564322763.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/80291994265.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/jikazonizovowiditug.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/tepezipilenider.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210612150024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=shinobu+project+vr+download+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED77 27120 bytes
SHA-256: 51fa0d41b899931e4f9c60960dfd9b076e740369a00cb9e3518b22ef0fdd7ccb
font_01_sfnt_off0001245d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245D 11040 bytes
SHA-256: b86fe5f6640745c3e11bb7ded4caf62f7431c29b6c4cc375eb98eb8b05a0950c
font_02_sfnt_off00013dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC4 16872 bytes
SHA-256: 0761d5f824080a34b601324bb329c6e3d315e11cd2ff30ad2c190a51f430a5bc
font_03_sfnt_off00015622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15622 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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