Malicious PDF — malware analysis report

Static analysis result for SHA-256 19f10301e6f96b8b…

MALICIOUS

PDF

78.0 KB Created: 2021-07-29 19:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 05208ed2151c955a68acfa946dadc2ff SHA-1: ab86cf6df576bc41b0fde0df83f9d6fd5f38d6f8 SHA-256: 19f10301e6f96b8bf9f20b45899f3fa1928531ce603f3b20633130d2224fefd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://krisoc.ru/uplcv?utm_term=hector+perez+montiel+fisica+2+para+bachilleratos+tecnologicos PDF link annotation
    • http://musorcentrum.hu/files/article/file/49493639494.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e476037949---75241916150.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/rulugenamejenituzosuta.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/1411182563.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/28179961827.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/3be45e4122454a11b0971e05b0cd5589/nalelifopo.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1d85c50a7---fototedufupodezofiji.pdfIn PDF document text
    • http://livinglearningandworking.org/clients/e/e0/e05af8355f71d8da3aa90f500b9284b3/File/sonadowodozavoge.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/24255157668.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/warisajukibawada.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/60322482426.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/f46cnboan9dqrceuepk9gbtqog/kerolalowatuvu.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070a635e0c49---55042989949.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/glusaepp0givg0ol2jnudnivsk/3119148842.pdfIn PDF document text
    • http://nhandieurangmuoi.com/ckfinder/userfiles/files/71196394149.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/69900562492.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/jt9mf083e01ba0c0v5agsd0edl/53157509875.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/ae38e2d0539846dceeefc4470d4fb342/sivutuvikatesagololepa.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/43b0bf6769a540917a29e64802040008/86821798801.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9798dfa2a---87655476635.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/b717762725449bb2f04cae269409c2bc/43717794820.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/33797776091.pdfIn PDF document text
    • https://nexusmediation.nl/files/64286840601.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ipk0rfojljatv8aii1reh91800/74135775593.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_off0000cacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACB 17024 bytes
SHA-256: 6eb996d8ca91a1ecd670d506f00a8766e56055f6555466c24ce9b08e995d9156
font_01_sfnt_off0000f5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A8 11236 bytes
SHA-256: a3aa55eddfeef3e0171828388bcc1e122ad1aa0d05ab1d0237c9e607e8d13e13
font_02_sfnt_off00010fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.