Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38044c128ecb1c5…

MALICIOUS

PDF

75.9 KB Created: 2021-09-29 05:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 928de8ec2f351854411048a1a1227a1b SHA-1: d28f5db8ee441f25cc0aab5851083bbf635197b8 SHA-256: c38044c128ecb1c59e92971e9551fcae23c54ad05efdd4d5ed37b05249fe4fe2
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but reinforcing the malicious nature indicated by the heuristics and URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://synerhu.ru/uplcv?utm_term=resident+evil+4+for+ppsspp+android PDF link annotation
    • http://etoprosto.ru/ckfinder/userfiles/files/fuzogesikapupib.pdfIn PDF document text
    • https://0908108108.tw/upfile/files/2021/09/25/wapogatizurozax.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/73vb392q5nsc1b4kinefmttst3/vepireleleva.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/bidilikulanokibaxubawoz.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/zezogirog.pdfIn PDF document text
    • http://osayit.com/images/file/59356474243.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/kaxitanariluvizapit.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/3f8af6be432129f640ccc50e371522ed/73362843999.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130eb5f04f24---febewotowalojoxudifajale.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/20890329698.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/56602931558.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/vimoxekiwarubitupage.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/jalanulubonivevuxoz.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/nuxenenunuxitimolofe.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/58260738861.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/91904954248.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/fojafozofujemoxifubaru.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/majalubejomin.pdfIn PDF document text
    • http://slsnn.ru/content/files/20245008482.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/xakamoduduxu.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/bosodinoxibanuba.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/jineborarin.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161396ffacc645---wemojeforekaligupidi.pdfIn PDF document text
    • 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_off0000bf85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD797 18956 bytes
SHA-256: f3bc76e6b9ea0c0e743b47800bbe7383859c31240fd92677b63b957a2899e3b4
font_02_sfnt_off00010967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10967 10680 bytes
SHA-256: 217278c95562815d96f3b7bb27a369143aa41490a8bb47bf47f707f8cb6f5207