Malicious PDF — malware analysis report

Static analysis result for SHA-256 38cf2ce57a731451…

MALICIOUS

PDF

72.1 KB Created: 2021-08-28 01:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ef5bc9f3e97cc163fbbb76026f1f34ac SHA-1: 108158fef080d693e1029d4d6da20c3e8004cf2b SHA-256: 38cf2ce57a73145156eacc6631bb41fe296fb7e518f19e36b9e0867dc513ab51
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The heuristics reveal it functions as a link farm, directing users to multiple domains, some of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to obscure the ultimate malicious destination. No scripts were extracted, and the document body was unreadable, but the presence of numerous external URIs strongly suggests a phishing or credential harvesting intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=derivation+of+kinetic+energy+and+potential+energy PDF link annotation
    • http://schodylux.pl/userfiles/file/ratoji.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/079754f7fe6c356e70189870bd1e16f4/84332000902.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/vibirodemizaxibolu.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/muzevasurer.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b91507cba1---6937098816.pdfIn PDF document text
    • http://labotinnghia.com/img/files/44633854866.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/tebefiposewajarawidukado.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021062219434773499.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/84151699737.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/76222005072.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f292e75106d---volemezavijavijoribaxu.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/xixogasiwexokib.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/71194666736.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/1kqvqil62dqdtoe40ia00gt3bi/suvexu.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/ropizegefaxagen.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/223bf793e2104290041aa9afa8ae3c28/jirilirexi.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d16cb3b6fb---laxejup.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/xazeboziseg.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/baved.pdfIn PDF document text
    • http://cwesp.biz/upload/file/670712423.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/60483197873.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/45758613006.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/tokipun.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/977038937.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/kawukawagixunuxodez.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_off0000b911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB911 10900 bytes
SHA-256: 4a6aa829e3161ab5d9769a930799d388ad9d799d0b248eddd2b97031289718a1
font_01_sfnt_off0000d245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD245 15264 bytes
SHA-256: f8fe01b216ea32aa72da563b74d84b01485d6156b54a208b1dc5a4e01591673a
font_02_sfnt_off0000f8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1