Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67ce4fa1b1b7d02…

MALICIOUS

PDF

94.4 KB Created: 2021-06-27 16:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a45c1efb21cbef68d47e74f02186ff1b SHA-1: 407a07a09d210016449996f7121fec02dc51fde5 SHA-256: f67ce4fa1b1b7d02d2646d8ccdb14042029b077c24d3c3f7715b621a21e7a9d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d41565999ae---56264602466.pdf In PDF document text
    • http://www.northern-japan.com/image/upload/File/76288692259.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2389ea5cc4---3522368122.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/031019499254.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/sigasupovinonudeverure.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/sgtmfg76s3qjqsn4r1ig5itcb2/xelagepegumad.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/6c5bb9c302b6d2f0c778a7301c09f786/gibikowawigejagamudikuv.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/lhkekvjhu7pa5snc2il2t0jk72/26189896389.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/fe66a0ff55e3bca796dada2230748553/mogufifavegilonokev.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/64945223190.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/65190989704.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/68630282123.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/xeroj.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/30966837735.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160be27f4a4497---megukenigotun.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084e7779fc39---33140197559.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a0cc42e23---vejafupufi.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/5970089837bce5bde15e2d51b039eae5/15930659666.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/ba0568c06cc8af576a92dea66734f748/56484867554.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa4d847025---65925700311.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/mevawoludisafipowobadofax.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607997f57bfaf---saluziduxumezunud.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/akmvmbfllt1btqic3idsrjm623/xowasulapisoviwetot.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607518ae5faa3---letutimedubogalevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+make+your+voice+deeper+womanPDF 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_off00010ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC6 16944 bytes
SHA-256: 4573ac750f72be4c91766f0bcee5a69f017d3c0c77575b531a6c6ff6d8d118b1
font_01_sfnt_off00013add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADD 10908 bytes
SHA-256: 01362296220140f26f9a74a5268524a3feb743492bce925e9360a4ab1b4400c3
font_02_sfnt_off0001541b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1541B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1