Malicious PDF — malware analysis report

Static analysis result for SHA-256 05c2153240cf9527…

MALICIOUS

PDF

100.7 KB Created: 2021-06-29 03:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 00b663ef3e70776ca59d513c332be8dd SHA-1: 7c445d9f16ca41276f8884584cc72ed82d7a3cc3 SHA-256: 05c2153240cf952727f01bf97d6c7b0201a43bb3b759ecda47e0520e47b5d607
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, identified by heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as Pdf.Phishing.Trojan. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the link farm structure is a common tactic for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728a4b145f8---zuzuniwob.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2b43b4e14---vikukipi.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/9716bc9371a0d30aaa10373606e7c08c/430361925.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6890be32a2---fatalexejomotamivorewu.pdf
    • http://donateagift.eu/userfiles/file/6908669450.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ad5249660---diwegalapo.pdf
    • http://easyreturn.store/userfiles/file/jobobijuxas.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f449eadbe---sujogifadutazilipulug.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/706171930.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/ea346a09bc362793a56a6d1a854ecb9a/budozovonafo.pdf
    • https://jxloanchien.com/style/postimage/file/rasuzigolusifotinureki.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/b5d4059e91428c31e024284e66cde609/50202245039.pdf
    • http://doktor-okonski.pl/uploadimg/file/10053504091.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/982b9b93f718735e1d0e6cd85518ab39/rawoxobozoxolipuwa.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608261120fe7b---23199370924.pdf
    • http://accessiblevehicleservices.com/userfiles/file/paxupexudefaj.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca2eb86eade---68493922942.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f015c38799---81542450515.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4d59981d0---tofosulise.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/aa594ad3775a373bd261f7634ff57455/xugujufaparonebode.pdf
    • https://rhodium.vn/uploads/news_file/39544126481.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/2dd384e41ce77fb61f5509c88d9a7559/fetetirenanapofefifa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=the+meaning+of+colleague
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011e8a.bin
ceec937eb790be6f429edb253ba961dec1bc0a62848705cf9a6a84a53f044a84		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11E8A 18688 bytes
font_00_sfnt_off0000eee3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE3 16792 bytes
font_01_sfnt_off000106fa.bin
8b539c08e997282d847fe2c72b6a0fba39e64ea8c16a66d14ea5a5d1e06ac98b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106FA 10480 bytes
font_03_sfnt_off00013cbb.bin
38c41c38c03dddd664ddeef8674a2acea7e6a48200c93c550c7c83314c637dcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBB 24952 bytes
font_04_sfnt_off00017a78.bin
ce6d42b19484eb7855e80161fe693838662a8ec99efc45d3032655dc49aa2c1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17A78 2392 bytes

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