Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5903448e6ae2eb8…

MALICIOUS

PDF

87.5 KB Created: 2021-07-27 05:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 14853ff821a9c566d33ba9391d7aa5ef SHA-1: 9839c1fa2ecb58d20b923ff418ef3bf292b68f96 SHA-256: b5903448e6ae2eb83eb5f8e7028747e12ae78c29f12442b87710724f79037708
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV specifically flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting, likely intended to lure users into clicking malicious links. The presence of these links and the overall detection profile suggest an attempt to deliver a phishing or trojanized payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://fullhousetourism.com/UploadFiles/file/20210522144251148.pdf In PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/aebbb2218d80e8e216953f5a30a9c1f6/88510331546.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/0d1805b154a3513c8b92e8fb758c5617/64536289492.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/14638963937.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/85967910179.pdfIn PDF document text
    • http://lawngo.net/fckfiles/56877986654.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9016357e07---xinapazexibuwezexumesava.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4a302b3af2---pobizumelibomeguvu.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b785613d010---81520444965.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/0jdiou4k5gack8evds1d1ethdj/14990127157.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/tasuwamaxebevik.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/2b0929e469cb3bb2e38a43fcfb7da0a0/30034823251.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceecaed7c9---waxaligazafud.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/nojisetuzemapofonagoxilu.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdca910bf7---80928001966.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/4681d9029e94532ddd0a7bfdb2a8c2ff/35956708568.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/7ae88d34defb430428545586d439db40/najapodepapalogufedene.pdfIn PDF document text
    • http://nature-revive.org/files/file/zezapusonunax.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608261fc98156---95786579283.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/jivetewotinisij.pdfIn PDF document text
    • http://brlairport.com/images/file/7251589209.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/l16ibu4oeskot8pjvp9t6991t4/55613833110.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160899271d4ec2---35424094874.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f0edbda68ab1649637b6479022c18919/97204095143.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+do+i+program+my+panasonic+tv+remotePDF 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_off0000f194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF194 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AB 11068 bytes
SHA-256: 5f80f5b229799a203e2ecbae5580ddabda794b5ac66e3bd6a132adedcb5a6cc6
font_02_sfnt_off00012347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12347 17000 bytes
SHA-256: de43fd9e49a1840697819e4dbd3ce453d9f7533bccdb973b2f4b7fa9224126dc

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