Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e09c5f7eb11673…

MALICIOUS

PDF

88.3 KB Created: 2021-09-01 18:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6bad6233474cbc683332c12effae54d9 SHA-1: 9f21693fb6288cf6e1e48c36d9dad3732d64c520 SHA-256: 84e09c5f7eb11673c0d6df61e686c22ac08cf8714d57e30a9ed06c4d6cb55241
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV both strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The primary function appears to be redirecting users to potentially malicious sites through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/c001bb3fd651bda92a9c748088118e64/nowewuradodolojita.pdf In PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cb19e80b2---suzozatenizabafuvi.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/70302043613.pdfIn PDF document text
    • http://skupka54.ru/upload/m/jaxibeboraxefaboziwisow.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/36573927036.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/poxuxujugofefuxibowipiwaf.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abae646452e---doban.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/xajuzuzivazodalij.pdfIn PDF document text
    • http://exima.kr/userData/board/file/somagamokusagofosadilo.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/betidunegim.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/vavejezizamusakanifeti.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/kisigade.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f492884492---21128408383.pdfIn PDF document text
    • https://cristalensi.com/public/File/ruxefux.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/78765ea19b32c2a0c55dacce6b43a5a4/80451475630.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/akgsb0graqqermds2p85uo3t91/59070316989.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/72d1c44861f1fe54583daaeb6cbfc18b/93142872921.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c7ee0fc21---9908026658.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/gpjm8oacu58bco7h2knqvne0k3/lugajataxas.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/ketolivug.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/0570850af7f9088c3e014a80b243546b/riwem.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/80715719317.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16123951852ef0---54511976097.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=solo+football+drillsPDF 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_off0000ef86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF86 10324 bytes
SHA-256: c8283af9827f26e1a097271dc9ba36706e9b27e2ea00ad8a94c501e815d62455
font_01_sfnt_off000106e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E0 20452 bytes
SHA-256: d3a1963bf599fff38ab75730f767596ad2a042e55f7e9cfea3a191ffd51b5db3
font_02_sfnt_off00013bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1