Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a4c54c59779f74…

MALICIOUS

PDF

90.7 KB Created: 2021-09-02 03:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: d6cf6c707aba897e6892be14b62b4f4a SHA-1: f2702e559877172fb1f3f49a8b2173d6a03ab206 SHA-256: e1a4c54c59779f745541cb3b027c5d9a32f6594fd9dd97f2c69f5ee1a42970da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c50bf58d23---zigabajuvok.pdf In PDF document text
    • http://alibabashipping.com/userfiles/file/tafadonodora.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9f54bbd2c---65675917203.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/81867951777.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/63407798866.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/c5e90d486c0c625bc5701853d686a87a/suwokovizab.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/puvetizosadapemajufugij.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da99e6c03e---2830769880.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/rajabisufufokinawuk.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/rupinafow.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/fafexagu.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021062106024673499.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/godasafoxikuzugegoxofawav.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/bonavuviwo.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/29999126434.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-8-15/20210815181952745864.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/gopabuxozesula.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/es1bmttghap4oo4k4co0oicr9a/digef.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/poduwimefuvexezabamisogu.pdfIn PDF document text
    • https://promise-land.com/upload/file/givigabozaromu.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/pefuwasujetod.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/69917433889.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/kinili.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/98829014576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=khalid+and+the+weekndPDF 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_off0000fd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1B 10124 bytes
SHA-256: ea0ebfa0cd8b8bc0f192d0e2044951c8d5999a047e44cbf893e23eabf54e8e62
font_01_sfnt_off000113a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A1 18760 bytes
SHA-256: e82695b9a4b73f72cd15a748cc5274ae39982b8830b22f7ab16ab572489e5dd4
font_02_sfnt_off000144d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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