Malicious PDF — malware analysis report

Static analysis result for SHA-256 20dfe37a8b0ed4fd…

MALICIOUS

PDF

88.4 KB Created: 2021-08-12 09:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2044a5435b5565540c63a70c8b9d10e0 SHA-1: 228a098c5ddbca642b1c16c3db12152c1866e2e0 SHA-256: 20dfe37a8b0ed4fdac0ad756f26bb5d90dce5ae4f2e3fd63df9ee2e6133fdb70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document delivery, often associated with spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://erdenet.mn/userfiles/file/baniponuzepobuvirabojujo.pdf In PDF document text
    • https://rajakeempat.com/contents//files/36157268083.pdfIn PDF document text
    • http://dogable.de/userfiles/file/gamadukipalumatu.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/6114282149.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/wikiveda.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/8639bc027773cb711ecb215800b60a59/79385450528.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1f6ed65d3---43531008424.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/ebeb446d237aa6362821fa198154a89a/19198063557.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b04ced061---munomabunakuxoredakumaw.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/8af9102a16e3a7a8c6feaa6c4448f3f5/22472720877.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/1942150303.pdfIn PDF document text
    • http://wshs67rocks.com/clients/9/94/942520bde836a0b401740df6f3d23d35/File/tedukisezawanux.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/7183200192.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/oq4ssgug7t6ht08fbqdh8ajipn/25063529544.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/s1sjnr2pui5iq0orfrc154tnoc/lapolukokumujim.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608f31caa0e2e---30698491525.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/1l1v14ngou30kasr2mvh1989gb/maduzupujakoxo.pdfIn PDF document text
    • http://flgr.ru/files/files/mutedirokalasuj.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/lc5n7caiq7g01135s9acplsu77/45137595368.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210803/file/levisok.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ac27362f0---53150248371.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=usando+la+criba+de+eratostenes+encuentra+los+n%C3%BAmeros+primosPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off00013614.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13614 17388 bytes
SHA-256: 23ee3b11606de192249547eeb242eb028ba6bdb224dfe895a9897838dc28eae6
font_00_sfnt_off0000d4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC6 11036 bytes
SHA-256: 245abe63d4cd3465ade8a872277425f105962435482122ee2fc8a713908c4b40
font_02_sfnt_off000105fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FC 18624 bytes
SHA-256: 24ecb5e474fbd784671f593b9a9669d6e0a9bd752d1de28a98db5be87fc7d776

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