Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a40887f2a50250…

MALICIOUS

PDF

91.5 KB Created: 2021-07-10 10:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ff46a1f251e2bec1cb85675275d0f5f3 SHA-1: 76789799d8df3ade46ba12f18e283d6c8b4c8da1 SHA-256: 67a40887f2a502501dced68cf5602a5b2baa8a0cee977d5604aedf04801d6c47
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1534 Steal or Forge Credentials

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. Heuristics identify it as a credential phishing lure impersonating Microsoft, directing users to a link farm hosted on compromised WordPress sites. The embedded URLs and link farm structure suggest an attempt to trick users into downloading further malicious content or submitting credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+get+your+steam+trade+link+on+mobile.
  • 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 http://zonweringbelgie.nl/ckfinder/userfiles/files/xosukefeliletinixagazakoj.pdf In PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/767c588889ca76bbe5c30b878ecff6af/52870488788.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/hidl84g3scehc40ucvl312q530/46802375645.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/61b018baa15f1a54e31c3848ae0333b3/kokug.pdfIn PDF document text
    • http://santeh.md/img/files/zebedema.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/64c436dd66519f57e82c505e768ce3ec/jabuvukoxetev.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/wejotofokulisomasi.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160796bc2de323---56135439910.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/86186829095.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/jl48losiug6s4hoq1m7vvfbbg8/guxukekedika.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b93bfc2507e---vajidaweravo.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/gudujivifitosifevazexonop.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/kifuvaviwul.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/48863186089.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/695310f50f378068f00adb2f5c309d37/12052066143.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608c71ad87c75---wibizenaxol.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/5068422aef4dde3aee351bd41320adb5/10991483622.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d177aad687---zaromuziwuvex.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7d6d67f72---37033355413.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/bixusakedajikuxeg.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/22946559319.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160870a0840307---kobunakokifebozo.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/pf411i371bkh2044m91cpp9oel/52860871144.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/80020424305.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+get+your+steam+trade+link+on+mobilePDF link annotation
    • 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_off00010276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10276 16972 bytes
SHA-256: 5e78a69c7518d0ff2c85f18035d80694d228c1bb1643a98d15b9a8d6a9101577
font_01_sfnt_off00012ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC0 11116 bytes
SHA-256: 8a957b1a9543de28e886c8dfe774314173642bb87009fd901eabf89b17273fe0
font_02_sfnt_off0001487c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1487C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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