Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1fe6e7f813c5e3…

MALICIOUS

PDF

80.9 KB Created: 2021-09-15 10:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7ce5b2f44b89911440399fbd9821592e SHA-1: 9d3251b62b0f2fd79121a98d9abd8bab6a448d61 SHA-256: 5a1fe6e7f813c5e34f1e0a243d9f7238de1d72dc7bad2d457cad333dff51fd91
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using non-clustered, disposable hosting for link farms, suggesting an attempt to distribute malicious content or phish users. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • 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://venus-forever.com/image/files/wimim.pdf In PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/12356910219.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/90572269404.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/20269463041.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/kamuwukejajibizirojelimi.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/mofor.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/34951982a064abc492c908157c160358/lutogudopakijuxifufukubu.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/tuwemuzezu.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613004707e5e9---98277415871.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/a27b9d74f20884736ca1e6fdb460c3e7/74298002347.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/xonuvizarevofadi.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/31004902513.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/68768258391.pdfIn PDF document text
    • http://wjcopy.com/upload/files/wisip.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/senepurezuwebiwem.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/11487568147.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/22146367362.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/4227750298.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/widejiwonerexane.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/d1bripqi0nfh5sm4dp2jjnkar6/85304232142.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210902002259.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/77367428255.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/93165173641.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/88250088721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=windows+7+isosPDF 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_off0000dbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB6 9832 bytes
SHA-256: 58e40c9b45f0bead6c5aded3c02ea036480b7946796f60bcaf82662bb99ef587
font_01_sfnt_off0000f16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16E 17372 bytes
SHA-256: c9785075b2dcbfb0543e59af532e2305e78de1ab626cba3d8335138e18901d86
font_02_sfnt_off00011e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1