Malicious PDF — malware analysis report

Static analysis result for SHA-256 0544040a70c47a61…

MALICIOUS

PDF

89.0 KB Created: 2021-06-30 00:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: bc33cecb2fc4a8b3d3cdc958a93a1e40 SHA-1: 0da0e54c8424c6c81d3b9ce0556b749420e28a46 SHA-256: 0544040a70c47a6180919e80fbd165d38f8d6259cc23cf73a617032ca9dca04c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The embedded URLs likely serve as lures to download further malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://queure.ru/uplcv?utm_term=no+period+for+three+months+not+pregnant PDF link annotation
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e10db3c71---43708649579.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16098bbfdda264---57946322064.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d76cad22df---84824707629.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/9846f24eb2b9e3a42e07ce05e2392695/646369801.pdfIn PDF document text
    • http://aweibel.com/Photo/file/96396466192.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984a6072a9c---didup.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/cd139f3b9fb4026052739cbbb0cd9f3e/dobubekamuweja.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfa693e869---gemukizotawexijofega.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/figedutuwedagibavuregiwom.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c24cec12460---gusutiwukefene.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105211111.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/2547005264.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/7e927092db0c3a86af1be8da83043646/20093762991.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/zaduzokenabijiw.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab4f2ae291---62725475023.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/786244179.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/nububokikokokaw.pdfIn PDF document text
    • http://4bx.pl/public/file/35846837919.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/5122b2206de9605c0951fe8241984b09/rejuvonabowuxu.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/25404701924.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/b8e6163bc312904f3b9b2082dd01a9fc/ravewapimuji.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794412242af---fuwitejanizoromilisepi.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/2451466495.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/1ab0ad1ff799df47c93df12a8e1f2344/teposikubuw.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_off0000f9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E0 10876 bytes
SHA-256: 955c5c5e29b144f548c4210238dbfb11fda04a499dcd91c0c73e789ec05d984d
font_02_sfnt_off00012a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9E 16500 bytes
SHA-256: eee1b3b13be29d6bdd5ce0b0e42c92e798132437fcb424b7cafd0a575e1bc9aa

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