Malicious PDF — malware analysis report

Static analysis result for SHA-256 52fd77eeb26da4b2…

MALICIOUS

PDF

87.2 KB Created: 2021-09-07 21:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 53fbb1aed583f887ade674ff0f961a6b SHA-1: ef90863f8b2b640567fd5a099eb9b51c93969551 SHA-256: 52fd77eeb26da4b2d035b91979636379915436524379283b3882ae05ab5b996c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://xn--kprq5pvqklteonubj6c.tw/CKEdit/upload/files/nozezevepimajoxujon.pdf In PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210702_02BB8BA085311872.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/zomebiriliximan.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0c945eebc---gafonemeribifavev.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607331095a86e---gafamuzokozaxejedekavedi.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/gibekidobilisajikori.pdfIn PDF document text
    • http://zerosquareonline.com/file/97255410457.pdfIn PDF document text
    • http://liyangah.com/Upload/file/17247092190.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/433c436450d08ac9799381d9163eab94/limutewesuboratif.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/78052648124.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/0166c7c72e11cbae5d647f2a974c2fe3/68767608242.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/pitutofefuxases.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/31051196146.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/cde42a1c586d16bc4f8e2d529218ffec/84508193820.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/wiponerutawar.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/fovafovudigif.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/e8to1na9jkhktq4hhvvsn8bk9l/sikax.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/zajaxujetesixivosupod.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611a391940fe2---7830107397.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/mukififojuwaron.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3db0823470---falaviwakuterav.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/newomo.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/74743843221.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2f1d78ebc---konov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=five+feet+apart+movie+script+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB1 18056 bytes
SHA-256: f3bb0967deb772b8f07890b3de212cf9181923c8f038042a6212e52859b667f2
font_02_sfnt_off00012ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE5 2160 bytes
SHA-256: 37152d19e110259e1a7542e959dd63b0166cb66739f48510bb38e63d3d1f8b26
font_03_sfnt_off0001367a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1367A 10676 bytes
SHA-256: cc27a7044a2faeeb3390141d9c3b5bd40f4bb0f68ab2565ea02c40a563cff1c2

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