Malicious PDF — malware analysis report

Static analysis result for SHA-256 50993fad38f2fdf1…

MALICIOUS

PDF

74.6 KB Created: 2021-09-19 21:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d2710d2a67052f1ed2097bc469ddfb8 SHA-1: 9d31879e2c92d240c3de98854d5d4343336073ce SHA-256: 50993fad38f2fdf1d7aa80d7e40724107588c37bbf333c3b2794e5490db5c985
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host a large number of links, potentially to manipulate search engine results or direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://specializzati.tecnaevolution.it/dataload/ckupload/68617888668.pdf
    • http://langeline.com/ckeditor/upload/files/60736677575.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161456cec9e084---80005274874.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/20086116093.pdf
    • http://motorlustor.net/userfiles/file/50467169710.pdf
    • http://desushibar.com/userfiles/file/ligosewisoxotopobunupu.pdf
    • http://vattuxaydunghl.com/userfiles/file/13908775661.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/1e6f08bfd6314beb81776952208d2cf5/sunosasa.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161350d9d58faa---kewupobixov.pdf
    • http://bilmatbasim.com/userfiles/file/8668492552.pdf
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/pofepumutuf.pdf
    • https://ihotel2b.com/upfiles/editor/files/18596357217.pdf
    • http://h-n-s.net/userfiles/file/77240828927.pdf
    • https://edinburghpools.com/contents/files/53201369411.pdf
    • https://strings97.hu/userfiles/file/3332511666.pdf
    • http://fuhua.tumujike.com/assets/upload/files/202109141618259550.pdf
    • https://adesso-moosburg.de/images/file/64852493454.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/ed32445591a8372c9b6f635225260c50/minizusemonakozib.pdf
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sovotokajevazegogitominal.pdf
    • https://stijsr.com/userfiles/file/54640187017.pdf
    • http://asremajazi.com/uploads/files/fefurobawikokowedadovup.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d9075dee86a800ccee185e5b20e6508d/vopegixufowuju.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=apk+24+creator
    • 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_off0000bfa8.bin
5ade71287ea73599d90ff35ff68ea42f861fcc7666d0f55ca96988d64b68255c
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA8 10228 bytes
font_01_sfnt_off0000d6e8.bin
b968c9e69507ee17bbd0937620853a13eed58a1e8458b376ad85c0a1d61ed5f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E8 18120 bytes
font_02_sfnt_off00010595.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10595 16792 bytes