Malicious PDF — malware analysis report

Static analysis result for SHA-256 df6ef64fcd52bc8a…

MALICIOUS

PDF

83.3 KB Created: 2021-09-03 20:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d6001ce4e72c78e1576d7ccadc5673a0 SHA-1: 58a061356926be954b9347648c48debeab89a765 SHA-256: df6ef64fcd52bc8a7bdb75c0b5518ad882946a7db1f1b97043a2c695631bd286
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on disposable hosting and the use of 'utm_term' parameters suggest a link farm designed to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c60ab88d01---99341864672.pdf In PDF document text
    • http://vejwun.cz/images/lexatokopapevodimu.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/82664523712.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/28579404154.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/fotuvapumor.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/waxigimuga.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/91685533994.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/zaridux.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607167efc6f70---gudujatonujus.pdfIn PDF document text
    • http://chipgene.com/image/files/20210714_062909.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a2fc5017d---tozigosu.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b61cedafb---ropebawufumefitifirizi.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/vuxadeno.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfefa08b4c---finovowi.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/tikogemej.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/tmp/navagib.pdfIn PDF document text
    • http://w-mill.jp/images/file/poraw.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/bolejupematanexelezuxafud.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/3775975051.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a370e790e2171339534274bcc0a5f286/demubonufuzasozuvefitu.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/60701509794.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c0bac67305---dukunova.pdfIn PDF document text
    • http://holzweiss.at/96383600401.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a129c5c4180---31610955694.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/sefavafaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=vivekananda+kendra+padavali+pdfPDF 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_off0000e2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B8 10232 bytes
SHA-256: 7f49f67581d7b8bcdf35a95c0d49f167f25687f0077fc4d80af961670ae06b5f
font_01_sfnt_off0000f9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BA 17700 bytes
SHA-256: a97edffa12932d5c5eaa9cd4f25536e33c9304db553c690c827a422aeb116f17
font_02_sfnt_off0001275f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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