Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8fd20d0d698947a…

MALICIOUS

PDF

86.3 KB Created: 2021-06-29 23:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 2260b20c9003dfca091d037e48130550 SHA-1: aa8e36c817fca790f6f388a7cb7285568f2d302d SHA-256: a8fd20d0d698947a77fe9481f0d682aa52cdcec468d91ef1778ba39cf9d5262d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure users into clicking malicious links, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec9edccabe---budatojuterenekuvisuvikod.pdf In PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1f31165c---71002486774.pdfIn PDF document text
    • https://medtek.vn/storage/file/bijesokedo.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160808325a8074---43829832127.pdfIn PDF document text
    • http://hydrem.ru/images/file/88063778061.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3fbad1834---fudijajukan.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160b47f39ceb7f---70807500520.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2f7f13763---71504231711.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/uudcbi6kpigus8uoldom07sf8m/94029770402.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/vujhk9bsonggbkhiio7oajlbs1/migelijet.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2a838cdb8---donipagazej.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/70479605071.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/06/23/file/19410412145.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b672a29d2---wogemafofazijonofos.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607796ad24c0a---88699239220.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/301950491534.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/fudapipa.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/69444274590.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092e4ac9c7be---pilexef.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/0891hri00p8g8hnobgtni7phqb/30430228214.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/i3vtono80e2p8366g1ie8l8hk3/18274819795.pdfIn PDF document text
    • https://bkht.vn/userfiles/file/mikoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=ideal+independent+c24+boiler+manualPDF 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_off0000efba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBA 10896 bytes
SHA-256: 3d2827926be0f4a2ba521aa67a5e7cb7ffdd6b1c4b75d17e6ea163cedb697741
font_01_sfnt_off000108b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B4 16640 bytes
SHA-256: 6be12c22dda5756b87195ab2c49f556e45bca1a9db71e7b63f37953feab51e0e
font_02_sfnt_off000133eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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