Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d62a6319446bc7…

MALICIOUS

PDF

70.3 KB Created: 2021-09-29 05:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: deca973aa7587b681fdfc6cac3dcdf9a SHA-1: 958fed4c055ae67c2f6d30f91d93bc8cfb96a4e8 SHA-256: b3d62a6319446bc780413bf5c8c99114629caec6c4f26d88e847272114b5eef0
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=animelover+apk+download+for+android PDF link annotation
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/galup.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/27432941501.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/80284203109.pdfIn PDF document text
    • http://sentai.cc/data/file/20210925_052903_333.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/12081071657.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/e654fcb9606c0b73de022293976a926a/23274800341.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/gazezimolozuwujijomo.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/tipati.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/63006219202.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141dad408102.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/4d8d8ac8de89e7fd506f07c1a1b790fd/62662606145.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/3be6b83999aaac7611abd5feb0f6bcb9/tanezeponutukizojupe.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/62e9cee2429883d78b1d9421eeb86f9e/wefuxenipabid.pdfIn PDF document text
    • https://taflanelektronik.com/img/userfiles/file/lasaviremafekekez.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/lumukexadixadekeri.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/jijedijusoraxibamatobu.pdfIn PDF document text
    • http://mauthietkedep.info/upload/files/20432873540.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/74874215383.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/33058649019.pdfIn PDF document text
    • http://hainfelderteich.at/zijetokitegofijudenesa.pdfIn PDF document text
    • http://eqsport.nl/userfiles/file/joxazajujazavida.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/40420658778.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/dawuda.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/lunuzafa.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_off0000b078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB078 15832 bytes
SHA-256: ce1fb3d306ef0112fad7a45999a4363572660996094646058292c3376e26aaae
font_01_sfnt_off0000d941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD941 10616 bytes
SHA-256: a2decbea0e8e0ad10c9e79015e09a0845663430160233361c63bff4207e773de
font_02_sfnt_off0000f185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF185 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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