Malicious PDF — malware analysis report

Static analysis result for SHA-256 e80be5b6b1a8ff75…

MALICIOUS

PDF

71.3 KB Created: 2021-09-17 15:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d674d7d8c1ef53996faa88c0f96957c9 SHA-1: c2fe58ccbc1d481ae8c97dbe1d4a11a6954650a1 SHA-256: e80be5b6b1a8ff7556277d96ba1d222df6839fbc9878e934eb81d6d4d305c949
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous embedded URLs, many pointing to compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The heuristic 'SE_QR_LURE' also suggests a potential QR code phishing attempt, though no QR code was explicitly extracted.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://coretry.ru/uplcv?utm_term=ultimate+flash+sonic+shadow PDF link annotation
    • https://ceccarbotosani.ro/userfiles/file/mutudifulozufomupetijanix.pdfIn PDF document text
    • http://emannsltd.com/userfiles/82343452782.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/dosami.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f69dcbbc4a---27342277408.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210911190455.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/9148684798.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/jireborinigiziliwesukamog.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/67282180020.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3268e6071---63876489084.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-17/images/files/67983044623.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/50489100697.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/e6b6e7ee013c8aa3e5f7222a17b012a2/rivevow.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/kenobazewa.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/58534424740.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/tubojipaxige.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/donekoj.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/witixumesigetovegapuwesi.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/83782306341.pdfIn PDF document text
    • http://rvhifi.cz/files/file/60212140038.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/78246558711.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB670 15968 bytes
SHA-256: e09d1ddd25a522f52f10a6b4b41e4468356fbba23842be8bec0800dfe536774a
font_01_sfnt_off0000df3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF752 10732 bytes
SHA-256: 12bebd986773ac4d9f4a41cc3d4b768473027d7c9f02e0b58ebab570bd61a363