Malicious PDF — malware analysis report

Static analysis result for SHA-256 95aa24b51ebbbe53…

MALICIOUS

PDF

74.1 KB Created: 2021-09-15 15:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: fff5dc671e8152df7169ada9ad669983 SHA-1: b85078f3b1d4ec8a96d939da4c33c22c389c83d4 SHA-256: 95aa24b51ebbbe53947107e96ff7a589a97bc04c3fe36f8dcaec75e036318880
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised websites or are hosted on disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 http://adabaskimerkezi.com/upload/file/vumozupaxepotune.pdf In PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/43144190514.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/lavepagok.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/46555977391.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109032219038212.pdfIn PDF document text
    • https://izometal.net/mm/file/ruziruk.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/elia09bcr10un5tk0l6i8aj8bf/jerazapojoxabonoxujim.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/muvivizukagifavipofone.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/79609862423.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/gazeruredonivunolijojupev.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/62686988518.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/momaferojugovovokojito.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2b0330299---93508839960.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/wuruwelolo.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/bukubozozim.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/vaperulit.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/8v0mntqp9j8r1aafac8ckhndbl/xofekitegajofe.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/knnropvvi9v4j037basn38s553/69969333186.pdfIn PDF document text
    • http://china-guolin.com/filespath/files/20210909184217.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/32002305300.pdfIn PDF document text
    • http://vhz.cz/user-files/21273215843.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/80088585718.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8468cb965---38814919562.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/a852995e8614ec06c0601d86bb63725e/dafitupanixeg.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/70844342708.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613165a667155---58762365192.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/52977548527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+print+two+pages+per+sheetPDF 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_off0000c1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CE 10560 bytes
SHA-256: 299a7ceef9feb75064b7fe029b844bd92aaa73bf387986bb47153250cb7deece
font_01_sfnt_off0000d9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F8 15704 bytes
SHA-256: 3ee7b3d69f5958ffcdbac898e86adb07339dd8daab172c032a848e9a1fa08459