Malicious PDF — malware analysis report

Static analysis result for SHA-256 513c4a78930d6fec…

MALICIOUS

PDF

77.0 KB Created: 2021-08-25 11:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6d139bab335482e3e440fffcdfb8b0b3 SHA-1: 5282d04be47a1da24feac85215636054b1716046 SHA-256: 513c4a78930d6fecac3eb87cf3f6855985926ee95aab596bb764a8152ba51d4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The primary attack pattern observed is the use of a link farm to distribute traffic across multiple compromised or untrusted domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://icltindia.in/userfiles/file/sutazujixisigamoxinavir.pdf In PDF document text
    • http://nissanotogovap.vn/uploads/images/files/15621794415.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/90541919133.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606efa804a561---fedisejuduzolefove.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97702d2eef---pevupuwosowejojawepokumew.pdfIn PDF document text
    • http://greenglobepms.com/uploads/89627733894.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095bf4253988---pinemodevuwekavodex.pdfIn PDF document text
    • https://easybuildapp.com/files/uploaded/files/fuwewera.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/43806221485.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/3ae17a8e5ce4a84657c0dd92b6edaf0b/xetivexowoza.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/44778535603.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca41835841---24464304235.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/90728937827.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/febudegubejekajagix.pdfIn PDF document text
    • http://dothanhigh1970.com/clients/6/63/63ba8bdc6fdca46b25bb56d5732eafc9/File/83459144566.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607234f8b947d---71989054074.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/ruzipurunezisad.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/35369852318.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/92627177947.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c548fbc0ecb---denufid.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/modupedusejoramexod.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/5dec73926071135e2116c27109ad8458/dikiputebipopevukofiku.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/fisiviworofewipiganipukaw.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/77844468786.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b677cea8e---nopuvutugokikejirenaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=chevy+c5500+owners+manualPDF 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://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_off0000c936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC936 10956 bytes
SHA-256: 4f4a5735665b2b29024207e5ee992d4042b40dd23e22f2cccdba461c169bd4fb
font_01_sfnt_off0000e293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE293 16228 bytes
SHA-256: b63ce481a134c7992be124d63fbfca8e1734cbb5918077ebfda35ba94467dcad
font_02_sfnt_off00010cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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