Malicious PDF — malware analysis report

Static analysis result for SHA-256 c15abf7076b5b5ff…

MALICIOUS

PDF

83.8 KB Created: 2021-09-02 16:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 02a46e437a969f3c05771216ce6948a9 SHA-1: a94c1518f3cfe071c23d64ba3621ef7a756292af SHA-256: c15abf7076b5b5ff65879ee24af02c93450ed4c8e3663b37ee1bf44c2bdebc1f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to host malicious files. The presence of a download button lure and ClamAV detection further supports a malicious intent. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=disable+automatically+open+pdf+after+saving PDF link annotation
    • http://e2ingenieros.com/ckfinder/userfiles/files/pofowedikof.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/99996f17406eaa2dc9930893698d8e8f/torowil.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7c4631f2a6---89332471477.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202108120729056510.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/vigosejizajasazadopon.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/6088a288db7e20adbd1317b9843201f1/somuxuxoloruzagabifupuseb.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/8cf5b14faf2c4804d2278a26300db994/pelobanoze.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/fofewowiwev.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/duzetonugofipunirezupidix.pdfIn PDF document text
    • http://infracsap.hu/files/file/pawukunurizifavasot.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/528phso2rsq7cl82seu6c7td0a/94240601858.pdfIn PDF document text
    • http://fxmeat.com/upload/file/df7589524430fe510ba26adc5f1bba56.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/lumajud.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb58a37b14---fawafak.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/nv30m3splf4hv725iet5dqonb7/89840171437.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed53ae46a2f---tizosonegokegewaname.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608a21390da5a---wupos.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/65872231411.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af9d25151c---28091428422.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b865d9770e8---jamajerotudarusonede.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/a0gv95ikkqvnil5gukbq83m84m/xemezowomegulixe.pdfIn PDF document text
    • http://www.520amis.com/upload/files/61368945497.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607774ac961c4---fadubaromozep.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdf76b5d5d---xelutowokewew.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf4b0810a1---14500855924.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e26802373---vufafojigawotedixitelifu.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610b8f1ec4dbf---xikuba.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_off0000df17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF17 11384 bytes
SHA-256: 6140d9f2b688c386fa84c2c89687a8b8d1b01946d0f3b59e455a9cb5d0567326
font_01_sfnt_off0000f989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF989 18312 bytes
SHA-256: fd55f913334fb31222d31b7db61be4497ad466b912f53256dfbdc1c141be51e4
font_02_sfnt_off00012906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12906 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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