Malicious PDF — malware analysis report

Static analysis result for SHA-256 850c2ac2abc8ab4d…

MALICIOUS

PDF

77.7 KB Created: 2021-09-09 23:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f573baaeb216b467480133abb507539c SHA-1: 2125cc9e9cad43a5c8478ed188c6ba8b8aa531c5 SHA-256: 850c2ac2abc8ab4d18621f094388cba1492219013610cad2a70c5478f63f29ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://ketchas.ru/uplcv?utm_term=flight+sim+unblocked PDF link annotation
    • https://astdubai.co/userfiles/files/semaburupidagego.pdfIn PDF document text
    • http://askort.pl/Upload/file/tuxavigugokilonijugozus.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/7180643840.pdfIn PDF document text
    • https://pecintajp.com/contents/files/7631293133.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/luwedaza.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/mevewagivobisigefel.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/7172218626.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d5ab5bf01---wosifevuzafijubemozotinib.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/30296861683.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/91402185863.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/bipikotazu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376f023e423---tenulizufimupumiretasumu.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/juvowizojozaz.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/12798462128.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/83076353879.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109012320071863.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/nujewobunuzewofofusuli.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/nogibudizefos.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/gabobuzud.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161394e650e463---kabolivotemitubajofebejej.pdfIn PDF document text
    • https://jingchengs.com/jingchengs/ckfinder/files/20210905015631.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210902142709.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/wajososume.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/mugejupo.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/fabam.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEE 17384 bytes
SHA-256: 00d8b3e95db5c1c994f41297fc06b200669e7f893abc6396837980f55c85fcf4
font_01_sfnt_off0000f8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D7 10864 bytes
SHA-256: 3d7a6b878052bac2f3f107f51008a2f2c7d0bc645b7b859030fc084c5231b4e0
font_02_sfnt_off00011184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11184 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.