Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b770bbea7baba6…

MALICIOUS

PDF

72.4 KB Created: 2021-09-24 21:38:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6552bf6fd4ce6a537cc0ba2eed776d89 SHA-1: fbee55b951b8f33bcd9203ec575804865f183d98 SHA-256: b3b770bbea7baba6a5d7f2eb9e06d84043b4b2ea7ea9aa43ce3e6faecedcb86b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://penal-garazh.ru/files/16834940883.pdf In PDF document text
    • https://iphastkala.com/userfiles/file/zatodezibudekadomevuwo.pdfIn PDF document text
    • https://eniedu.com/data/file/20210914101205.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/nivezu.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141196789014---xuwodobiregewogezuli.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/781876726.pdfIn PDF document text
    • http://baove24h.info/upload/files/runelasepibizukukana.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/25455095790.pdfIn PDF document text
    • http://ort168.com/upload/ckeditor/files/nisanabovi.pdfIn PDF document text
    • http://sarlampa.ru/In PDF document text
    • http://flapboxes.com/userfiles/files/dasawamibowozefireje.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/18887995885.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613e631f0b176---52054055589.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/tajefuvopokako.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614095db9f88d---42088440015.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/sepepopifilig.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f879718e49---dejoragudogubevirejafu.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161323d8bf00e6---68208843763.pdfIn PDF document text
    • http://mopron.ru/upload/files/99131877287.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371c2dc8935---10992850342.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/70381880254.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/58381616933.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-4/20210904211556237108.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+disable+mic+on+headphones+androidPDF 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_off0000b3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E8 10996 bytes
SHA-256: 4c9910355a4b25b6bbe74656459d810194d9667637cff79d8ed81f326a4f1185
font_01_sfnt_off0000cd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD01 18488 bytes
SHA-256: 955d75ecb20443ac272853345a2ab880830d993f204c0742e59f456edd336cbf
font_02_sfnt_off0000fbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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