Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d628e7c18581881…

MALICIOUS

PDF

118.4 KB Created: 2021-05-27 19:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: fd503ef32a135098870f8a731c9e4dc3 SHA-1: 547ab008a11fa980cc5d47a8f4915105a04dcd09 SHA-256: 6d628e7c18581881d96d118d6f0f123df745d31b7d3af2b456eabbfd1481e688
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072c45ed3e44---33251625833.pdf In PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/7dbc22cac5d74e5c21090984a1d1c3d4/jinitavizat.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a58d4ee6eb1---36241903927.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a31bdcea84f---52721722911.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/a1729b30b49f516c58f52f9246276b7b/ginebivijaxapefupane.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/mewivoke.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8230c1748---51049443515.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086eec0ecdad---bogiwarumodobotulaf.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/46b269a06bdcac16eb316850dd40fcf9/ruwekidive.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160aeb0978dbaa---79006412121.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16097fd9e488c7---velimi.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160784fc274c3f---xedobak.pdfIn PDF document text
    • https://medtek.vn/storage/file/wimulodokawagewofafuje.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/cfda15cbe9745eceb438dc0b0a9e0145/93243986347.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160732e225b7a7---nuzinigasewalapulomebi.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/ql115e07lm7nhebq0qfhai34h2/lonoxezexukurofi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=jane+the+virgin+chapter+82+monologue+scriptPDF 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001a484.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1A484 16984 bytes
SHA-256: ede90dca2f1fc894f411541daaeeb26d213709b0d76ab85a1e9171c657b80072
font_00_sfnt_off00015b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B8A 3484 bytes
SHA-256: 51a9ae4a489101e407ffe38c892c7cad8e6372f1096a5d82d6f435fa3a985dcf
font_01_sfnt_off00016816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16816 5604 bytes
SHA-256: f36cc839b7fb14c477243449e56252078dd4af2c69d5427088b68f1cda619dc8
font_02_sfnt_off00017af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AF1 12268 bytes
SHA-256: 400995eecb92cf460ba6faaecf49cbc41841ee539dfd81a3b714958d88263020
font_04_sfnt_off0001bd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD06 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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