Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a606489ee5265c…

MALICIOUS

PDF

80.7 KB Created: 2021-09-20 16:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d12bb39119f65af6e334dd1b0aa6f276 SHA-1: 1913c3f7b9be4eebaa3772ed932dedd317ba8381 SHA-256: a4a606489ee5265c82a146e4217a7c6a460df84d52fceeb5cbd78c7bce2ac43f
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 websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=faceniff+session+hijacker+for+android PDF link annotation
    • http://wefocusdesign.com/upload/files/48503103214.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/denogetifizoxoni.pdfIn PDF document text
    • http://balone.net/_upload/file///zozinujopijogewid.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/7574694374.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/28455056837.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/modukuroripalon.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614879f47c505---13609094479.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210917_4747D1A857059E6F.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/43663833738.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/15655691044.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea30ced458---27792699620.pdfIn PDF document text
    • https://drgcode.managenet.ro/images/file/59644669651.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/rimabapo.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613437c50bf37---pifunimuwimovuwokukexidam.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/59796312273.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/59496533369.pdfIn PDF document text
    • http://noithatmyhome.com/img/files/22197756685.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16132d13817946---2589451319.pdfIn PDF document text
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/54645327114.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/porepewunameto.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/wisopiwabev.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/torokedanesopabokep.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/sejuzovuzovidiludaxa.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/gobadoruxefademuzafizeze.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_off0000d7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C2 10628 bytes
SHA-256: 2b12dca84f99278d4a274f8359b770298217389c37b9189d55bb485d64557e5c
font_01_sfnt_off0000eff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10807 17512 bytes
SHA-256: 0d6ad59e74e392c635176b46e18cc6c8294ea467151510a19ffa1e264825da77

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