Malicious PDF — malware analysis report

Static analysis result for SHA-256 8273dd4aa4283f82…

MALICIOUS

PDF

68.3 KB Created: 2021-09-28 11:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8be5d4ac1f8ee1c43bb2d3bb5e0b2314 SHA-1: 15eb186b0a45d2b20dc19ed369843a5475ff907d SHA-256: 8273dd4aa4283f8244facc56e50ae6e4662ff69d32a1c85245e0327a996639b0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. The numerous URLs extracted, many pointing to compromised CMS uploads or disposable hosting, suggest a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://queure.ru/uplcv?utm_term=gta+san+andreas+mod+apk+download+for+android PDF link annotation
    • http://delfosventures.com/userfiles/files/koxulezasatifumev.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16133ba55e0e32---33069710975.pdfIn PDF document text
    • http://jawarakreasi.com/file/61453400868.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139dfe29fcad---wilatibizo.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa09ae1571---73610837416.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/65143171649.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/85765808081.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210927144734.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/wasixelosiwanep.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/94777327991.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///texojoveturasi.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210928065002.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/xobafojujalojezopojawenu.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150ddd62235c---volatezabedaramos.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/71151157415.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/tobagu.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/tegelirajepov.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/belitil.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/35526187021.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/136456400.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/wurasazifodogufozojem.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_off0000aeec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FE 13948 bytes
SHA-256: 96b85c2a63c9e9f0ea3dd8cf5220fef646df654543c4b09eae0e93b2df659733
font_02_sfnt_off0000e9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E1 10876 bytes
SHA-256: d229b593d99834c6a96ebfbcf807136dbabe37ae101715fa4e4f0d5d04720317

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