Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce55bb533b225ffa…

MALICIOUS

PDF

97.6 KB Created: 2021-08-11 00:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8e360368f98b907b14851c9c54bdb7c9 SHA-1: 55fff366df0ff3b1ac5a65adf287618597672ad4 SHA-256: ce55bb533b225ffaeb32d29a9afa6364437e0b6ff9b6e44fe4e74cf0b50196f4
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of an IP address literal in a URI further indicates a suspicious attempt to bypass domain-based security measures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe758cb32c---32778463020.pdf In PDF document text
    • http://krajinar.cz/soubory/files/vaduvegagopolalowiji.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160700358bdf8a---latovogerimafa.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/wufutatukiruremowefibo.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087fb90d4824---tofarisugim.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb2af4f7c3.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/393c05e8c01e6d7b738b4065956a7a8e/60670417547.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1607b29a840d89---pevedisusoginifagomexeg.pdfPDF link annotation
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160f9ab824fd96---23931165007.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/11507340824.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/fakesi.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/58kq8hilq24paiioj4occnj6mi/61721932461.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/91406450391.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/kuteforixogifikekepo.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160feb8035b7c1---wufowerirazowaxupe.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qcnikkrqvu8anb9rs9tasgk936/sijobisu.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/sibolurezikuzisunamowader.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609654199f7dd---46573758147.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/71194666736.pdfIn PDF document text
    • http://kalikraft.com/images/file/rebiwekodedatufapenigeso.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/ropiped.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/55626850759.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/12052496502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=teenage+mutant+ninja+turtles+2012+season+2+episode+10+dailymotionPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c09de08c477---lulef.pdfIn PDF document text
    • 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_off00011354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11354 11336 bytes
SHA-256: a0d5661ab386eaa4b0d72507f33c4bf4f415297b24813ab72a20cbee440a9b46
font_01_sfnt_off00012dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E2 18952 bytes
SHA-256: 66a8b01dbd1d340e706da30e8ceb898042d6ef36fb6f48f638f28bb960a93f4d

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