Malicious PDF — malware analysis report

Static analysis result for SHA-256 684c55e76522ce33…

MALICIOUS

PDF

79.1 KB Created: 2021-09-20 20:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4df2b731223fb6f890d9d2cdf08dfffe SHA-1: e0aecf52171e84b114bc8baf55522b5855827919 SHA-256: 684c55e76522ce3375208bc007fb964abe5ea0d8e3fcacb8c781e2319d530887
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs that point to compromised websites and link farms, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The file's structure and URL distribution pattern are consistent with a malicious PDF designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://irlanc.ru/uplcv?utm_term=star+wars+juyo+form PDF link annotation
    • http://pokrowce-ochronne.pl/Upload/file/39379043309.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/161427f12a84d0---92297227332.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fe4487ddb---54326512875.pdfIn PDF document text
    • http://asfalon.com/__files/file/16868331070.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/550591598.pdfIn PDF document text
    • http://halanmilk.com/upload/files/riwepanawo.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/55684150025.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/pevibikagugufolunujepeb.pdfIn PDF document text
    • https://electroagro.es/pub/files/guxusewiriwuzekagok.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/45011680837.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/valuvobofuxefaf.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16130f22c5f03f---fisogoxaj.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/49058361721.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/nukobakaxas.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/daraditozimakebe.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/gewatovufitaro.pdfIn PDF document text
    • https://eltdb.com/UserFiles/files/98838067965.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-19/20210919181758737064.pdfIn PDF document text
    • http://tctrack.vn/images/newtech/files/fefivid.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/80536983196.pdfIn PDF document text
    • https://mbp.hastatis.com/mbp/upload/images/images/upload/ckfinder/lejuwaxajuravoveluxa.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388b03b90b6---koxasikam.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_off0000d398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD398 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAA 16944 bytes
SHA-256: ada3b322686fd97cffe3fe8b0eccb424480b544dd85bb5c32771db0497a70507
font_02_sfnt_off0001179e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179E 10508 bytes
SHA-256: f6b5ae45ded2b252fe1cc797cb70379da37e58577d6a846966f3dc9162da55e9