Malicious PDF — malware analysis report

Static analysis result for SHA-256 45859c02f6e3db42…

MALICIOUS

PDF

95.9 KB Created: 2021-07-17 05:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: adf53257a8d097ecc473969dd667ac84 SHA-1: 16b5b44e24b7e7b238f59161eb6626407f8e63e2 SHA-256: 45859c02f6e3db42c557f580664b129df87553c25f5c57d3a9bc8a677e0814a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, preventing a deeper analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 http://aplus.to/userfiles/file/jirope.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092efa03e291---81555497550.pdf
    • http://eotp.info/sites/default/files/fck/file/xapekiliwejerazexam.pdf
    • http://staractivecollection.com/resimler/site/files/dejinuxefa.pdf
    • https://anjingliar.com/contents//files/dozogaliwejepejenomu.pdf
    • http://railwaysrailroads.com/upload_files/files/pijuwaludusavakusulazi.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070ede588dfd---gidisab.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/lsaqoiema14mn513nkp1b80mu2/fegemarosovot.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/7eba4c2b219c1adeddb17a9bbc942124/55687951470.pdf
    • http://abpaluso.com/upload/file/lirowowazowedurage.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e095fef2fd6---guxamosoxubejowegefi.pdf
    • http://pomodorolennep.de/gfx/userfiles/files/lakaju.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/f3pi91lb72qtqof8emsg7kt938/79438208991.pdf
    • https://vidaleve.net/ckfinder/userfiles/files/vifuxo.pdf
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/5823065102.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2414b5527f---22853552593.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/ao0c01pi4cqsc3l82bv9d3m13g/92420948146.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969c5dbd03f.pdf
    • https://kozhikodedeaf.org/admin/my_files/file/repedosaxutujabumuru.pdf
    • https://amitadevnani.com/userfiles/file/dafaragudokewok.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b788909e75---tavuvifasurowaresugagog.pdf
    • http://lhjmfamily.com/clients/5/5d/5d8645f74963a96e1aea25f3b610eff6/File/3212914759.pdf
    • http://nbnjl.com/userfiles/files/23861213950.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/79bc7776b79891730e61f6dbfed334c2/newixixewinagiwez.pdf
    • https://discovery99.com/userfiles/file/poruxuled.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/c3fc798d0541deb9fdafa96786d07cff/patejofefeguxumebokipuzil.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=hermann+hesse+journey+to+the+east+pdf
    • 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_off00011602.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11602 16792 bytes
font_01_sfnt_off00012e14.bin
f08d938a546804d491eeec8af1967481967534a28d21950994caa2dca31fc194
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E14 17028 bytes
font_02_sfnt_off000159c1.bin
b2c26c99d0b1a87bc820c5007658e5436dd0338c6cfc3d1b4cae6b8beab02776
pdf-font-stream PDF embedded font (sfnt) at offset 0x159C1 10960 bytes