Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb7674563792672…

MALICIOUS

PDF

83.5 KB Created: 2021-06-26 07:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6458b1ac93d5bd62f3d9650254099425 SHA-1: f73ac91bef764b0a97ca36fc4f068461696f656d SHA-256: 1fb7674563792672f44991d51eb129ab63a11b43ef775f0e8a88f19c822e9e56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which appear to be compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious link farms designed to redirect users to harmful content.

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://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/lck5gj0q1uc2igloaebu7l5mrj/51288028415.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4955078124---96304812987.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f18c3f99d---46713354802.pdf
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/rovenefeketinefa.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/4872733d016dd8b4686ca98cdfb23df9/22856422533.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/0c6ebbd73cf543a00d477b8e145158fb/rakozabakal.pdf
    • http://bestapp4u.com/admin/uploadedfiles/file/parubozewi.pdf
    • http://mobilesamara.com/img/files/file/60138397697.pdf
    • http://studiotecnicobonoli.com/userfiles/files/bolijiju.pdf
    • https://www.epicbrands.co/wp-content/plugins/super-forms/uploads/php/files/86dc61e6c70e0a85199434a0cc37cb1e/15613890319.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160831b09857bb---felanu.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e888dd704---72779967064.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160980ae09c9e7---manazakaduma.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b23b7b34376---65374285905.pdf
    • https://ivanamihic.com//files/binazamebakixalogukatelo.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b76f80296b---wumewoniwu.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/4de3a7269d183140e6c9ed4bdc60f3fb/robuka.pdf
    • http://hoangle.vn/uploads/userfiles/file/44776965431.pdf
    • http://talleresjpg.es/img/file/81452154111.pdf
    • https://emilline.dk/ckfinder/userfiles/files/kabinowutisutewisowed.pdf
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/4c6f08cca6f9171af1d5ecb3b989d7cc/6944936136.pdf
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/lubejapuwazonufagubiz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=geometry+questions+and+answers+for+grade+11
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e400.bin
42b26ad2c6660479307ca42291525280a81e8f34ad1acd9e64bb4dc9bedd8811
pdf-font-stream PDF embedded font (sfnt) at offset 0xE400 16548 bytes
font_01_sfnt_off00010eda.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDA 16792 bytes
font_02_sfnt_off000126f1.bin
43bf7a5e6fcae8097a9140ac258f63c9406cf99474235b58c00dbc3f141cd3bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x126F1 11188 bytes