Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c7bcc291d6bf2d…

MALICIOUS

PDF

82.7 KB Created: 2021-09-16 03:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 073ab798e8c223e72aa9447862cf735a SHA-1: beeeb46633965281f9509610deb26329b73e1304 SHA-256: 71c7bcc291d6bf2d8ea29023f8884a227ec18ce4ad8cac104c5c4db3e0422012
196 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malicious content or engage in phishing. The presence of a link farm suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://catamma.ru/uplcv?utm_term=transfert+fichiers+android+vers+mac PDF link annotation
    • http://beiwendq.com/userfiles/file/ziniliraxije.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/73066237701.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/95534706286.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/xizudikilizog.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/89953285846.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/u1jsijjrei41j4ovbo5jt6sosi/94644707276.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/waxipate.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/45280783324.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161427f640c833---bixigozexupe.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/bajibaruxobap.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/xepepije.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/48548514d70c0fa9337fc0173a81a9e6/julifatakolurigax.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/vibumagogiwezitaw.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139956b4623d---19594259038.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344ef0c7d55---94257143114.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/wosiriripelopixegibanoj.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/xagekofugodowetixefefepif.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/jikogakubakuwusaxagup.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/wopakuwir.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/bewavavegexutute.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/madelimozivumesofalud.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/likid.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_off0000dea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA7 10724 bytes
SHA-256: 1461e3cd7fb4622e57826d7f032754832b42ec1c78215f9af5676dd1a091a2e6
font_01_sfnt_off0000f724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF724 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F36 18488 bytes
SHA-256: dcff33cd2ac44afbb328d34a81617514bf3913148a211a121e05602a765fabc6

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