Malicious PDF — malware analysis report

Static analysis result for SHA-256 801343b84a46763b…

MALICIOUS

PDF

90.3 KB Created: 2021-09-07 11:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 167a8d0b6bc30c48e0a5e80254927321 SHA-1: f9f9f9c3e5607b44616b4d708dc0f29247311d71 SHA-256: 801343b84a46763b7a11dd8cb860eb3d33932fc97021b99d23a4f041f66291b1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the extensive URL list is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://pistant.ru/uplcv?utm_term=persuasive+language+worksheet+answers PDF link annotation
    • http://uralinteh.com/uploads/files/tiwodibukamidaza.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d42023418---newujegoginefosu.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/80950645451.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/bulukon.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983ff32b158---kipubozapotizej.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/93591608393.pdfIn PDF document text
    • http://tcmoving4cure.com/clients/a/a2/a295acc0500fd37d831de80ba00a7552/File/15034992061.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/89225893191.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b51859ca62e---82401013887.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/53319727494.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/2cm91humu8pk8c8lbisorsck2v/gugewupopukika.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/gemedufafaz.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/fea53d5483b152984ee8305b22049e04/38594273883.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/42263481973.pdfIn PDF document text
    • https://herfection.tw/upload/ckfinder_temp/files/20210623163405.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/0bae8ef9846e72f581be4bc4f50f8041/65844026166.pdfIn PDF document text
    • https://mollis.rs//files/toreresuvajogodona.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/s5e78rp3d9i1966nntcau6s8t5/lanavivosanegibos.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/vigrfhcki2kkmk4fs2o24uq2r6/59333057577.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16090308a8b678---zelorukezarune.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/59014733858.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/duzitobuvawawu.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608b69df99dcd---57187467396.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/47311703110.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210725_30FC0D0318C3AE6A.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/78190440942.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_off0000f764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF764 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F76 19508 bytes
SHA-256: c898937769f56aff13fb07fc31276d9ef40ede5f91110373fab025ebc47339a5
font_02_sfnt_off0001422c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1422C 10732 bytes
SHA-256: 89f14a98fca4466d26b3e2ec78c0fce855b0aa8d74da72fad3ea9cfca30a70dd

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