Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb770e332bfeab91…

MALICIOUS

PDF

83.1 KB Created: 2021-09-14 10:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6f17287880d5b018f34f5434c6e6d814 SHA-1: 3efed8f6f552844c66d465f7276fdf87d3e48bad SHA-256: bb770e332bfeab916c1b26a8089ffdbb889252c45ff3243efd24000282307e8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The presence of external URIs and link farm characteristics suggests the PDF is designed to redirect users to malicious websites, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=last+day+rules+apk PDF link annotation
    • https://lideregitimpaketleri.com/calisma2/files/uploads/48894490047.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/8239002146.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210912093821.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/vesamukipizogevofosudabit.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/41814068680.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373f71aa094---falunokodevigad.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/33995692960.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109012202222225.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/0e8b5344b64c994992fc44df0b2ad869/vozosad.pdfIn PDF document text
    • http://mextro.de/upload/files/lenenazabewuzaros.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/dejexixewuritefoduvawidis.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137362119952---rigunomejata.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/57444411196.pdfIn PDF document text
    • https://mytshirtcreator.com/app/webroot/files/file/paxikuzebipemedesamepivax.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/vuxowifet.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/56360114470.pdfIn PDF document text
    • https://etadelloro.it/images/file/burijel.pdfIn PDF document text
    • http://belean.pl/userfiles/file/tifazixosonejij.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/29940930086.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613394bb54cdd---jepob.pdfIn PDF document text
    • https://mediaskills.rs/files/bafukanekamalegikumib.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/larujefasajuram.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/17911955902.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210906024419.pdfIn PDF document text
    • http://sdsenlex.com/upload/files/94880510219.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC24D 20720 bytes
SHA-256: ac540266036ba34e8f2ea48edbb62ff0e8319b09482f7220d1c7b4113333555e
font_01_sfnt_off0000f7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B1 16568 bytes
SHA-256: 438f65be821eb90465cf93e8d75055de7baf3c42c8cc54c7c8b84131e1221b44
font_02_sfnt_off00010ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF9 10332 bytes
SHA-256: 653b26cdd433b8312b5489efc9c0d4127c6f6e758b5710cf385532a02c01f328
font_03_sfnt_off0001267c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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