Malicious PDF — malware analysis report

Static analysis result for SHA-256 da2b19f554487ebe…

MALICIOUS

PDF

86.3 KB Created: 2021-09-21 21:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 70e6a585d7b2cd72830cc78c63a28884 SHA-1: 8f1c94f01594e61b67bc27b34c41ab6147f71c55 SHA-256: da2b19f554487ebe761a2d8e67104b546b6dbe21f576bc83f48ab194f5c65a34
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to websites utilizing CMS upload vulnerabilities, suggesting a link farm designed for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the presence of external URIs and compromised CMS upload links supports this assessment. No scripts were extracted, but the structure and embedded links are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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://coretry.ru/uplcv?utm_term=comics+and+cartoon+maker+apk PDF link annotation
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/guqdif8g95f99mmsq31s5he3vr/xovuxugotugu.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/161480a0694f1c---mosume.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/jugelamumagaguw.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/galugaduxoxozelaje.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/vudavuginuwigavaluminuboj.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/93376470185.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/78050699229.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/vubiledidulix.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/3356077538ad3b01ef06d0aa0cc9763e/gedavomakikerebeda.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416fdef34a7---waloguxurov.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/fapamuwituvezawumoxaje.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/73474364464.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/79181992688.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/99663460254.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/lugaweperuxoteb.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/ruxifojojuxob.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/c99946kifdkuua82jtr985gqkjdtcsjj/5772570718.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021921359346083.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/rexerimoxomaxalajexa.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/rabopunogukizijomevabif.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/sijokulilufenunesixorow.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/65859926405.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/dofofomubopib.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_off0000e89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B1 19192 bytes
SHA-256: 0fa41dd86bbcaeed4f79e0c6f4873dba709d7dcb516ad116f1ae8bc522fbd5e0
font_02_sfnt_off000132cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CC 10752 bytes
SHA-256: 37e5de703c4e74e0c8b6bc6eb823fa395ab8cb6b990ff03b499f6539accbef8e