Malicious PDF — malware analysis report

Static analysis result for SHA-256 0990ecdeb529b9ad…

MALICIOUS

PDF

90.9 KB Created: 2021-07-08 06:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b6ff4261914ccb703cf133c17f920300 SHA-1: 64e3fb4a5789a75d5e0c33f5f8f9449a53b3fed9 SHA-256: 0990ecdeb529b9adc1d4bd9cff62b71e9b57ae4282dc14101bf0b2e00e07c449
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The presence of UTM parameters in some URLs suggests a tracking or campaign-oriented approach.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://medvor.ru/uplcv?utm_term=r+mommy+speech+therapy PDF link annotation
    • https://bamfieldrental.com/userfiles/file/dusuboponigixitumadux.pdfIn PDF document text
    • https://flyags.com/editorResources/file///91597829624.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078828dd82c1---jaledip.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/f3e8b6e5331b15d0f5f51b5e67182b6b/bogutusolimugidenit.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/gq8ep4b1h9l50vidti0feiul2o/70212736837.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/d9ba5d4e6a3aaa95b98b392804f2d3ef/sulerese.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607096d1c6bec---nulakirovipajovijaxorem.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c8735aad1---jubegoxukizolafebaxuzixe.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/17553093522.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/26228749657.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/tukadaxikimalopazasuj.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/kegigetaliwifuti.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/gli469pu3pf5d0q0ilijh9sq61/pibejetizejagop.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c79ad5f73b---mumowojojisesosamozupi.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/13179630536.pdfIn PDF document text
    • http://nature-revive.org/files/file/48360021602.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/nerekowezinalexitodobote.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/tt0p9o1gb5qksbb7edoug48phm/sixadelejalutebi.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/tubupowaxidodegij.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/dinurosakivolup.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160d23eab00604---godad.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a94e3b8d3---59808286322.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00011199.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11199 17616 bytes
SHA-256: e78b130b59379009e4676fb56621e9aaa4e8cbb41aadafda96c76fb29748ccc8
font_00_sfnt_off0000e5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DC 16876 bytes
SHA-256: 771fa94350ad3b12b5464a90adbb5be658c687a8a3859ee7981a3f144fda09ed
font_02_sfnt_off00012c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C80 10556 bytes
SHA-256: b257b324869596cbde5abe060d05ce76d88594a06d5697178de69ada44d4cb21
font_03_sfnt_off000144ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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