Malicious PDF — malware analysis report

Static analysis result for SHA-256 823c22f1cbaa5a03…

MALICIOUS

PDF

83.4 KB Created: 2021-06-30 02:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b0a38b6ca2e9442d5878d92618ce52ea SHA-1: 7042f7a48811e723979935fb3fe6d3ee955d4b74 SHA-256: 823c22f1cbaa5a031df43d17c913c6632880d823f6485cbe1c8e38ca9f23576d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The 'SE_ADVANCE_FEE_SCAM_LURE' heuristic indicates the document's content is designed to trick users into paying fees for a prize or parcel. Numerous embedded URLs point to compromised websites and link farms, suggesting the primary function is to redirect users to malicious content or phishing sites. No scripts were extracted, but the presence of numerous external links and the nature of the heuristics strongly suggest a phishing or scamming attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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=how+to+graph+cubics
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/884c91a76444669f5cca0cbce5c6ad6e/67854546638.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b737c74da4d---suwazejuzimumime.pdf
    • http://simonide.org/userfiles/file/70092909886.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86dc94f4f---jexawiledifo.pdf
    • https://esperanzadeavila.com/fotos/file/warifegimosusazovinog.pdf
    • http://intergeored.com/upload/File/roxiluwagulibiliwixuv.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a084e0688---puzabugewokadopap.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/21a3d98aa60525f95956f1e0c67f978f/2233348543.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/1daf6274f734742bdd1c35abe7486f27/xulubejixopu.pdf
    • https://vildmarksjagt.dk/userfiles/file/5060760598.pdf
    • https://keongracun.org/contents//files/85853224826.pdf
    • http://gphs84.com/clients/866382/File/76760766940.pdf
    • http://bjhtdszdh.com/v15/Upload/file/2021624323322125.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/c2dda20de9f25ca3c06a2bff670d8abc/sajugozuwapuvekerevo.pdf
    • https://silga.ca/userfiles/file/76895681385.pdf
    • https://animaliadielisa.com/file/budasegobekik.pdf
    • http://fine-cottage.ru/userfiles/files/86593579676.pdf
    • https://faprosid.com/file/wikaremuruwa.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/d9fcf4674105f68c2bb25b5ec682d1b7/nexukig.pdf
    • https://radmangroup-ye.com/rgfiles/file/xaramozovizujebufodise.pdf
    • http://aqbnb.com/uploadfile/file/56987125920.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc783c4389---80757480802.pdf
    • https://anjingliar2.com/contents//files/kuluwabesijugevinemab.pdf
    • https://bleikss.com/userfiles/file/tefovebupaget.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e189.bin
49f4ff511d85ad758920c7c1e8052c8a05da608fe4c4701b1b228ec4a01b9a02
pdf-font-stream PDF embedded font (sfnt) at offset 0xE189 17624 bytes
font_01_sfnt_off00010fc2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC2 16792 bytes
font_02_sfnt_off000127d9.bin
8f84603ab6236dfa553ca854a20e2861fe68a16f38196366ab487fe8c65b3b64
pdf-font-stream PDF embedded font (sfnt) at offset 0x127D9 10688 bytes