Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28358dadc0453a4…

MALICIOUS

PDF

89.1 KB Created: 2021-08-25 01:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: b01bda37df898d9a9c09bd47eabcac9a SHA-1: 0bfc070d06f6f3118bf49246e6022b1f0ffdcc95 SHA-256: c28358dadc0453a4d5d4f0568579a534e3e5c30ef99da2aec561dc7164610600
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely provides a password to decrypt an archive, a common tactic to evade security scans. Multiple URLs are present, some pointing to compromised CMS upload storage, suggesting a distribution mechanism for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://wendi101.com/userfiles/file/gugovogagowovisogajaf.pdf In PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/0s3as65tan5fj60tdi4etfp3p1/dodapax.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160f5e8cec49f8---fulazepirujo.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/navutomojubofowemam.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/gamuwupugijelezulijogon.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0532b156b---10526631223.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/72150666210.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/rasagitadowikovixidasot.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/59792202028.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/vokepikegin.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9f7empmpk9gfnp2h08hp9a5v20/63880279802.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/jazof.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/cl00igugriik5p1n61186flofv/57033044473.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160738864812d8---wonivozidigidutapiwotosif.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/68030956264.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/14515586723.pdfIn PDF document text
    • http://metallpress.info/files/watepojowejawazegibunidup.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/9fde0215866a64e954beae489375275f/23311843005.pdfIn PDF document text
    • http://micruts.org/userfiles/file/nasitexuxokonoxiwemiw.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/a456e2c934e5332ce0d78836c453d944/63875960931.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=convert+gridview+to+pdf+in+asp+netPDF 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_off0000f4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BB 18204 bytes
SHA-256: 4f7b0c67b92a236cf9da970fe35fae0c6e53ea929c9cde2b1a35ee7175725253
font_01_sfnt_off00012547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12547 10808 bytes
SHA-256: 6d740c806eee3b562b40ba64bf47d57ff37a1f8953f686ee3e12d9b35c090ca7
font_02_sfnt_off00013e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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