Malicious PDF — malware analysis report

Static analysis result for SHA-256 71bcd7ed9badf115…

MALICIOUS

PDF

88.4 KB Created: 2021-09-18 04:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fc1a161260d2dd7d62720feeae87f377 SHA-1: dc8c619d9639f2a677e33255fde8de934c5cb415 SHA-256: 71bcd7ed9badf1153cfdcde765bde1a55efd07a849d5c4fe47a163a3da7b194c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the heuristic firings point to the PDF's primary function being to facilitate access to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://nomylo.ru/uplcv?utm_term=redmi+poco+m2+pro+official+price+in+bangladesh PDF link annotation
    • https://heks-tech.com/app/webroot/userfiles/files/todaz.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/xodolepolupokijobomimolu.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/gexoratulogodu.pdfIn PDF document text
    • https://zagi.hr/files/37747971499.pdfIn PDF document text
    • http://efeteknikyapi.com/userfiles/files/31630246298.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161392b5c5b9c4---balitagemadax.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/56057729736.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/81515739277.pdfIn PDF document text
    • http://tonghuichem.com/upload/files/jajewilavuro.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/21488719772.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364608e1743---92493429422.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/pivanijarozuj.pdfIn PDF document text
    • http://sswjeans.com/files/49974812275.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/gorazepogav.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/tidowuxewaz.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161347df894aba---xuluzuri.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e17e08965d---64578248930.pdfIn PDF document text
    • https://citronel.com/userfiles/files/numasagofoletu.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/fowadavikeju.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/43949492545.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210909190428.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/pakiw.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/38190458518.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_off0000ebe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE3 19820 bytes
SHA-256: d0f5627b503631869fcb6f5815e929b7a477d030e865abbe157330b44000f8ec
font_01_sfnt_off00012033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001384a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384A 11276 bytes
SHA-256: fd372fb0943f4580faa4062f117c89e3974ba9dd22724684dfdbc26b836f0631

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