Malicious PDF — malware analysis report

Static analysis result for SHA-256 048ac477e597fcff…

MALICIOUS

PDF

84.0 KB Created: 2021-09-18 22:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6b217eff7521669971e49f37a3b30f03 SHA-1: 4310dab9353b7a8e1b88cfafc9ac6f6b54991886 SHA-256: 048ac477e597fcffc47e3df7b4aa545f1c215685e5bda8461324364b2ab4bbe7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=harvest+moon+back+to+nature+for+android+free+download PDF link annotation
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bcd9760c3---25343288307.pdfIn PDF document text
    • http://artio.pl/files/files/25895524442.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/5970c7d384d7984cad6827e0c4610cde/xivawowubababizaputaruto.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090804023473499.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/79241312303.pdfIn PDF document text
    • http://hueide.com/upload/files/dopenudifoberejuzenogowab.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/zazenijegut.pdfIn PDF document text
    • http://jainfarms.com/uploads/5930496337.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/sokufemamu.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/deteletetekotefibeguf.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16135eabe39f3a---poxorelolugotutokuxama.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140176b4f349---16738612454.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/2887345219.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/zovimegoj.pdfIn PDF document text
    • https://termoformat.md/img/files/zumazibomoweneniwerikuze.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/24857983926.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/80056326771.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090708112918.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/rasojumatuzavixewolux.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/sojodonifogutiwezowuk.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/29031299334.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/7253295915.pdfIn PDF document text
    • http://systempro.kr/userData/board/file/borupibizivenivafowegagil.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_off0000db65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB65 19980 bytes
SHA-256: ddc3f7bebb9073e99e0f2fb23d14cc59039818e6130e4cf3bdbe7986c0c9479f
font_01_sfnt_off00010fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DC 11112 bytes
SHA-256: c0561d00c71fb09cf16ae4f29c963b2c78b68c168302dcc3ea1c07de0f9f8f46