Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1a78ffa886ae2e…

MALICIOUS

PDF

84.2 KB Created: 2021-09-05 21:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e46e996d6972f0ab396b78b06897ce59 SHA-1: d70ed9cd7d1b08a3979ab198f5599d5dae02457f SHA-256: 8a1a78ffa886ae2e5aa574f4a827a46610bea5baddc8836268922ed5ae4cd637
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is classified as malicious and exhibits characteristics of an advance-fee scam, luring victims with promises of prizes or funds contingent on parcel delivery fees. The document contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a distribution network for such scams. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent, likely involving social engineering to defraud users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=importance+of+applied+social+science+pdf PDF link annotation
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/7ebb19302683d46fac5a944a1cdcd2da/49006135086.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/80373205497.pdfIn PDF document text
    • http://aweibel.com/Photo/file/diraxoluwonam.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/355bjdodcojcvjkikvl10h5ant/40504574321.pdfIn PDF document text
    • https://brakos.it/file/kotaxusutefolixajusu.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/29d5a060938730bd337f5354fec056c0/rurekom.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/rozurubumalepebufijivitof.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/h7jn4gojr5r90vu8cejvsrg5p8/foruso.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/u16glvkph17oju3ekqpu69o223/timenuxudike.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/zagimafesomuki.pdfIn PDF document text
    • http://strandedtattoo.net/file/88854697433.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/pokugosenometol.pdfIn PDF document text
    • https://kueapem.com/contents//files/61770882724.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1d5228d62---62011972772.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a26a9087a31---17889808002.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3924074e1f---towilefezafipukixogo.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/vl5p9rotkmsslpc81iompvc3gh/84532320795.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/96617692937.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/jixinobiwuvunerifu.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/ipsm7ugd74crtsej47b0ukcod0/36856179362.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/bolegebepemujeburadufil.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/7f55afff111db4192da354f516ac77af/2011102932.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b4095d1b56a---86250984712.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021070816373897.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_off0000e4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EB 10732 bytes
SHA-256: e5fc0ba24e5005cd582cba79801db57e761090b6329684429a91ef44899c9f5f
font_01_sfnt_off0000fd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11593 17512 bytes
SHA-256: d7a891b58ee266569d30169a6ec371a268e16df7d95af967d6b133276384e16c

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