Malicious PDF — malware analysis report

Static analysis result for SHA-256 63816682ce62bc62…

MALICIOUS

PDF

82.5 KB Created: 2021-09-20 12:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5b833a603c489fcf6b9e80a0eb0ffe2b SHA-1: 9e6ee6488f2e8aab727fc1400a75d69934e77dc7 SHA-256: 63816682ce62bc622bdb5ee5034aa0a823cd53f2861263ae56cf1c07783c6ead
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Numerous heuristics fired, including PDF_URI, PDF_SEO_DISPOSABLE_LINK_FARM, and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM, all pointing to the presence of external links. The document body was heavily obfuscated, but the presence of embedded URLs and the overall structure suggest a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself likely facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://chcial.ru/uplcv?utm_term=message+wala+apps PDF link annotation
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/pavuzosediwix.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/vafuxosagenuke.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/febozobake.pdfIn PDF document text
    • http://demkapi.com/resimler/files/pazetimawopateveg.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/21725749915.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/natiwedalumikatuzepixuv.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/161316480697db---zeminijob.pdfIn PDF document text
    • http://deltools.com/userfiles/file/56090378072.pdfIn PDF document text
    • http://atomleasing.ru/media/File/nejigegesave.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/99951307138.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210902111953.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109081057148054.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/xeberibukanuxigeduxavu.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/nivavonivozaz.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/koxemajovanujege.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146adbb0066d---56683066717.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/wafesereselevukojikud.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16134cca15b4a7---33572323961.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/lojado.pdfIn PDF document text
    • http://ucokampen.com/media/files/32765162056.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/14891242132.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/nisuwurebevupesomikik.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/86569573256.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_off0000e206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE206 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1C 9992 bytes
SHA-256: 59775edea995c1ed375b9496bc044cd9f4b2c07f494e2315711ab8568002158b
font_02_sfnt_off0001107b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107B 16944 bytes
SHA-256: fe0ceb7340e7c176c0b6139688f8cc81971dd3f022de8aebca6b2ff3245bd8e7

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