Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f99a7f906c0bb68…

MALICIOUS

PDF

71.4 KB Created: 2021-10-03 00:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9dd9b9278a5518d43f2d82c48671139f SHA-1: 5eb20a5472d0206bb41a930434cf809f6eeb49ca SHA-256: 8f99a7f906c0bb685b0c213b00d26e7032ba89d6dddb94d7f292c77162f2356f
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of `utm_term` parameters further indicates a phishing or spam campaign.

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://allytemp.ru/uplcv?utm_term=digital+card+for+marriage PDF link annotation
    • http://textstricker.de/benutzerdateien/79107533164.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/96238945393.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/4apagnkkf8chpfcbe466rb56qf/5781708339.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/fvvlr52ncnb2idtf9847lpm68r/gekizizeberotane.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/55299805246.pdfIn PDF document text
    • https://desco.scp.hr/files/96697331729.pdfIn PDF document text
    • http://www.kohkoodtns.com/image/upload/File/rebilukumizedike.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1614ff44816adb---46853505863.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/mubaxujelelo.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/82788100831.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/gatanesovajed.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/15416469530.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/94792490612.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/likufunufizinusuritaxer.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/19627147884.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16148132083196---nosuranavedukokikatuloxev.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b28944f55---1672429026.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e24ad960b4---femumu.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/vowolirisikezukexoxel.pdfIn PDF document text
    • https://4u70t3k0-4tl.com/contents/files/37139299788.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16158c8654aeda---93016411017.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/dagemunaseluwaxasobow.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/57980976594.pdfIn PDF document text
    • http://freestyler.cz/img/file/93049562694.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_off0000b525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB525 16836 bytes
SHA-256: a9f79f34c9a6116c4c5770879e6eb7086da7bef0e0b172316203454776ad9971
font_01_sfnt_off0000e072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE072 10548 bytes
SHA-256: fd360da476e869b594590384fec545b41d5c65b1aff5d756334da60c412e4f7d
font_02_sfnt_off0000f849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF849 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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