Malicious PDF — malware analysis report

Static analysis result for SHA-256 445a7f21059ab6ed…

MALICIOUS

PDF

77.2 KB Created: 2021-08-18 19:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-12
MD5: 9c92a3a5e4a564caa62de8526a14c21b SHA-1: 69fd108a7a572ff385a6b33c0b25f027e6dd316b SHA-256: 445a7f21059ab6ed3cf30cde2012b4a2b338e72e059bad5037b66c52db7b1876
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress upload storage. The embedded JavaScript likely facilitates the redirection to these compromised sites, which are then used to host further malicious content or phish for credentials. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest a tactic to distribute malicious links across various disposable or compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://alpanelektrik.com/depo/sayfaresim/file/8001661086.pdf In PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/75873584821.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/20fbd49f57a289ed37c545566b1e632a/84892467465.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609712b546024---xubebazabuvuluwumenekosa.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/25776981284.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/noxufefupexiset.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/gotunafajovimurodimo.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/vuguxuxopojebikek.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/33743945801.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba53ecb868f---12094150591.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/mumotofema.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/69146681721.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2295113d1b---56369895535.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/46565248086.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/pemiridiwitepobe.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/d1a7b4ca05f17db7227bf9303d2f9425/lalores.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/05evsa4ujpeo391l42t9l214c9/18079267974.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b712e89ee---82145680658.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/d3c9500ce7bc33fb85ef424119072c81/54563558541.pdfIn PDF document text
    • http://cloverdiamond.com/file/83394202193.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/bsb3btsbuoghh42qjrspl736gs/kaxabuteliralidinut.pdfIn PDF document text
    • http://polkovnik.su/upload/file/76511081510.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/12b7b2c0b7efa3977ea2074f5825e6f3/sizekarofipazit.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/zofukun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=benim+hocam+co%C4%9Frafya+video+ders+notlar%C4%B1+pdf+bayram+meralPDF 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_off0000c4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF5 18280 bytes
SHA-256: b8f15154e5c3bf7fc3eb778d2ddb8fa9f8e4d9c8c8bb9bad05ea7a429ec64e21
font_02_sfnt_off00010924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10924 11536 bytes
SHA-256: b047d4aa6855a3f4b7b87b6c7f1f3a2b314c47c27e85f83fda5a867d05572cba