Malicious PDF — malware analysis report

Static analysis result for SHA-256 7061fb4fddbf3451…

MALICIOUS

PDF

73.3 KB Created: 2021-09-18 14:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 47f9446f8486d720708c78eb6f1b79f2 SHA-1: e8799121a7d432c6143b7acae8da9ad987164a64 SHA-256: 7061fb4fddbf345132e00410857181e8e011d1efdc4e332921658774a5c9543a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, many of which point to domains that appear to be compromised or disposable, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the primary indicators are the URL heuristics and the malware detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://crestviewshopping.abwingsmd.com/uploads/files/koredakotagepi.pdf In PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/12295885419.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210911004548.pdfIn PDF document text
    • https://capitolmodels.tuzonanet.net/userfiles/file/puwirumudafew.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/bibabamonufasifewizopavi.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/6k05a7hmr0r6dd6hoco256r3h2/dinabi.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/82370448060.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/lonikinoditadivolefijib.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/35213652822.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c85fcebb7---kopewupusabalidudaxi.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/0b50efaec857b52bf984aec24b20b9a5/luramofevadupoko.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f005c2f3f2---dowepifu.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/janevolalirilarilixekusar.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/pomozinozidaviriji.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/ganawefajatan.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/89867663543.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/75ad08a5f44c5f8d6a8b10cfa4b74444/61391269385.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/32558337409.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/pasilufejumujaxaxa.pdfIn PDF document text
    • https://cargotavio.ru/files/file/kararewa.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/nipakubowoligiguv.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7daeb3f10---10666352652.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=kick+the+buddy+hack+modPDF 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_off0000bc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B2 10656 bytes
SHA-256: c13a47ae9b8c497710c1a3312ae5d3ef854fbb532d0ea57e9172ace2a5e44765
font_02_sfnt_off0000ed22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED22 16756 bytes
SHA-256: 0ab4a6ea8c1b12137af1392cf9086d782c678f84cba2d99986a6f75dc5e9d192

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