Malicious PDF — malware analysis report

Static analysis result for SHA-256 b515ac70704a4d3f…

MALICIOUS

PDF

102.4 KB Created: 2021-06-10 19:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8a93a46060fccc39f85f55cafd0f598a SHA-1: 9873a64c576557a3a52812eecbfd3e8d343a809b SHA-256: b515ac70704a4d3f21e7367f81aa0515daff77600f46495687d00d5c8e71f6aa
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The sample is a PDF document flagged by multiple heuristics as malicious, including a brand-impersonation credential phishing lure for Amazon. It contains numerous links to external websites, with a primary URL directing users to a site that attempts to trick them into providing credentials. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://allytemp.ru/uplcv?utm_term=among+us+hacker+mode+v12.
  • 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://allytemp.ru/uplcv?utm_term=among+us+hacker+mode+v12 PDF link annotation
    • https://chiataiec.com/userfiles/Proj_Name//files/wurolabilabi.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/11045445661.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/5bg9n1g862hrv30e74valtgcb4/xagopunikigomasu.pdfIn PDF document text
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/58498560408.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/sqija5lb3fl1tp689atfajjv8e/93176994194.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607787dfb87e1---73190319820.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/9c5jb1f8lbn05fj4nrh5k1v4em/pemep.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/a34a483791ed54b7c90e3794da300634/72570592931.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/mokotepebilosodavuwizub.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/38e5a047d06d2e660776c535908d40c0/3060100437.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/d868db5dc0777df2ed1510b365650393/mikuwuxinofape.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/wupijoleravepizof.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/82996331191.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/109d1feda900b4c7ea1ee93c79432ea2/xavosofiwavifapowupem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BF 6744 bytes
SHA-256: 0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63
font_01_sfnt_off000102a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A6 5372 bytes
SHA-256: 8f3da292ca629f680538543857b4ffd590049fb00b481867dcbc8e1d16e2566b
font_02_sfnt_off000114ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AD 15580 bytes
SHA-256: d2f18719424d27848042dfd68287ed3528c9c0481358edbe33c8f880b0afb989
font_03_sfnt_off00013f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F73 11332 bytes
SHA-256: 32fb66c9ca714c6e34d27ca28e1d81a2a1871b74e8fae04562c083548af47596
font_04_sfnt_off00016644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16644 16756 bytes
SHA-256: ec4e01bddcccca99ed43bd0ce4a655a00b21d54b202e678c34dc47c15c76a4ee
font_05_sfnt_off00017d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D63 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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