Malicious PDF — malware analysis report

Static analysis result for SHA-256 2be3d5e3c1b76194…

MALICIOUS

PDF

83.2 KB Created: 2021-09-08 19:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 92d52c0b1e1bc6958fee8f3f59edd867 SHA-1: 1beeb891016f3988339dc7289da461d1e75a9430 SHA-256: 2be3d5e3c1b76194f1a9da82c74c000e421083796fd60c80abe4a7af526c4b96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to a variety of domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nomylo.ru/uplcv?utm_term=niv+bible+commentary+pdf PDF link annotation
    • http://recviem.ru/img/upload/34677064826.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/85218768292.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210907063735.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/c450021e5de2252c89dc92780de6315d/dirozipiwamodumif.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/dapazazevituzu.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/86132931403.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/vaxunewavoruxunit.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/76615015437.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/zariwakedovovumedovij.pdfIn PDF document text
    • http://guowangcable.com/d/files/81608270974.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161325b73c557a---64020075928.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/sabinikixidopubew.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/17038383723.pdfIn PDF document text
    • http://iphysiology.ru/upload/nupavivufotojine.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/16324905673.pdfIn PDF document text
    • http://japhina.com/upload/file/48489097527.pdfIn PDF document text
    • http://renknh.com/ckupload/files/sudilumikakajenujawiv.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/99596518194.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/9d614f54d3438de701e854dbfa47fa41/61269804101.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/jawotinabopage.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/bumizududumoxenofelal.pdfIn PDF document text
    • https://edusfera.pl/upload/file/19939475837.pdfIn PDF document text
    • http://klenderbio.com/upload/files/84475477831.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/64191805935.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/82752385490.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_off0000e095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE095 10908 bytes
SHA-256: 5fa99cbd2e0b9ceded7ae71ee0d01fbff8b9886ba3ec64eb9f95d65cc3309755
font_01_sfnt_off0000f997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF997 17824 bytes
SHA-256: 375243206fbcf075ba56f54d1ca411e67cd866fadee5a633290cc031ac812f6c
font_02_sfnt_off000127aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1