Malicious PDF — malware analysis report

Static analysis result for SHA-256 de42a99534697bba…

MALICIOUS

PDF

81.9 KB Created: 2021-09-05 14:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c7fe39bdf745b73a1576d4995a1dc00a SHA-1: dcc22487c30d61981cba31c3c44ed2cdfd388a70 SHA-256: de42a99534697bbaa279f933db267bf81b5855739a7a637d3a474c6ac62b8f6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common tactic of using documents to drive traffic to attacker-controlled infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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=creating+a+business+plan+for+dummies+pdf PDF link annotation
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/f3ce59fb05f8f0a7a7f58c4c5da20f58/gekenud.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ad220028f---32985757289.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f63c1c13bed---modoti.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/61329633203.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/59117793834.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/heovgp2hp38uv7oe0grthcgf8j/zubizinadowajomarodejuge.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/sokidemimotibevizolofome.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/d5947a52919c428f6f78d4efa021d07f/wawituxefarupinuwu.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/ruluxepok.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/gapililemalezedufamebuzar.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/wabusejudoxabagegab.pdfIn PDF document text
    • http://cortabellanews.com/userimages/82727100071.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/62286594894.pdfIn PDF document text
    • http://unityproductions.com/upload/files/33205786878.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/tugujor.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/mopusoteko.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/jinogu.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095aa65a5303---40259290134.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/69212362396.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2945cdd10---pajumedetagovuwunopugedij.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/81257705209.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/1198ae767b5ff3eae878a368e233db6c/8031125142.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/72856374620.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_off0000db19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB19 17832 bytes
SHA-256: 9c8b33bd2f19fc022ca405eb0965ff1fc46ea34f47561776be3ca10b0a85e532
font_01_sfnt_off0001086f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086F 11112 bytes
SHA-256: fb7108c8a9c43ddbd0e1c0b264dce2129b3df38d68c48f182b4ac260da632544
font_02_sfnt_off000121ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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