Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b350e10d879603c…

MALICIOUS

PDF

83.3 KB Created: 2021-08-01 02:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f840dea1ccce43b080716e338c9310d5 SHA-1: 8fce7afea4c1e4d5e7b88d95b4f0f33102ab8574 SHA-256: 1b350e10d879603c1833021154fb353fe8c6e890e55363e9984ac32fa956c33b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, suggesting it's used to distribute or redirect to malicious content. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/pt6lie6vpv77q3ta4dldnj3qmp/rawixuzomoromanafoseb.pdf In PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/59791966855.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5134bcca6---nuziboriranugovopadadu.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/13830537780.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a9b22c7f7---lovumolurukajilelafoged.pdfIn PDF document text
    • http://ligneus.hu/upload/file/63911269115.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/dejopidi.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/dkn7f7uq5ord226psogp00oaac/megede.pdfIn PDF document text
    • https://ridersshop.it/file/golazig.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210514192843.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acec2490b01---joketipe.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e137576d33---rufadosedenogosi.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/e53f607a74eed94341110827901954ac/rogirusosipadubawafepe.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/9agrc5jak9tbhohh1otlefs2uu/75397135980.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/70932372002.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/0h0kqhbfsrul97bmi1hm99h6jq/28505350383.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/debafagojijojabe.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bd24488f9fa---57099143704.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/5ts1vgv2rlntnavc7b5er28eig/15434455596.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1d7be5646---lajelilowitifutosuso.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/ccmk1iruehe9qkdsnafk1m11ua/fosuzibadibuzekenab.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/827ea5a8fb5f5b632871cfffb3a21314/90443826854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=paraclis+maica+domnului+marian+moisePDF link annotation
    • 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_off0000d830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD830 10532 bytes
SHA-256: c2def17dd7cbdd16b9814586d635ac387f91ec93d21a15a866f6e7d36ef8bc07
font_01_sfnt_off0000f018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF018 22072 bytes
SHA-256: 28bcea2853df09692f3f02fcd1e22c8c754f438a92a5136c95f684e388257fb3
font_02_sfnt_off000125c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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