Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b55aa9b30eac644…

MALICIOUS

PDF

93.1 KB Created: 2021-07-02 06:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 76253921eef4c8f8e9a995eaa05e7b30 SHA-1: 2f355b9084b1cd0d6d1fab29456b12eb081de0ca SHA-256: 1b55aa9b30eac64464585c6219d7478901e2579245b31e7d2a8ffa14caf92c3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, containing numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely to distribute further malicious content or phish for information. The presence of multiple external URIs and link farms suggests an attempt to leverage SEO or distribute malware through indirect means.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/mavorelipeduduligog.pdf In PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/505d098aa8642318a9ca875ac9e0e738/80533199977.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d90bacbe7d4---76931009114.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/25312169466.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/raxisaxuvepanukisipef.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/93083794797.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/58938855843.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0a35dee61---77438425057.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/96617346221.pdfIn PDF document text
    • http://flexicourse.cz/res/file/94915523732.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3903d6f947---lenipizudobugulozukat.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d30e8ab2a---86744136737.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/jr7rp1bb1s33ioefchto3rqvv2/11998238099.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072e356d0a96---vonelezamovabu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b06b3dcfcbb---314352560.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/tapazat.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606d624bc93b6---gidexowomofezusupudodetun.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/42946974152.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0dc8c8c747---gevab.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/487d9c1996a2c1ea18dd1da427f32a9b/fipifazajadag.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/78e175358da2d7374ef4adeebd80cd4f/muduzipuxok.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/xemidarulukux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=story+of+the+rich+fool+in+the+biblePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A50 10432 bytes
SHA-256: ad885ccb2d6164f246326cd1f1daa02d39ceb0645759cbee07e34d927ff8af76
font_01_sfnt_off000121e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E1 16896 bytes
SHA-256: 7fc4780a88daedc6321b049c3534ec2437f74e36b14c48c5804719a72358866e
font_02_sfnt_off00014d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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