Malicious PDF — malware analysis report

Static analysis result for SHA-256 df530f0e8fbb817f…

MALICIOUS

PDF

88.5 KB Created: 2021-09-16 23:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8a2d843ee8599c9f82bf2184010a8985 SHA-1: 7f60221c5ea8f34b9fafdc3291a8f4b943ff8994 SHA-256: df530f0e8fbb817ff0c01462b04045043066b0c4cc1abeefe78ec974e867900e
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which are associated with link farms or compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics suggests the primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://archism.ru/uplcv?utm_term=biblia+takatifu+pdf PDF link annotation
    • http://asr-net.ru/uploads/files/birinimawetavojixuri.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/moliganabalusifoloxetuvo.pdfIn PDF document text
    • https://protraderin.com/userfiles/file/kanepujorepe.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/20392838570.pdfIn PDF document text
    • http://emannsltd.com/userfiles/fokerivu.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/ecfd3b77d96f7b8fee03d09bbab178c1/mafomomikotuva.pdfIn PDF document text
    • http://pedraferro.com/files/files/bimotenomagenoforeneze.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/19452646753.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sixabiwopiwexuvoxol.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109071045403846.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021091006244520.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/betobazesolidutibaponevux.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9b2eb69b3---18058071906.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/51997177859.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/67906332263.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/82442264118.pdfIn PDF document text
    • https://amityhr.com/userfiles/file/62452255232.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/fuwemosagaki.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed21b03aaa---lokalatudagak.pdfIn PDF document text
    • http://parentini.it/userfiles/files/filetimitunafemaxog.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1613f74135face---37305620413.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tuzebovaraxuviziji.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/54759603978.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_off0000f476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF476 18976 bytes
SHA-256: 25e9f6b0f6c96c288b5d751011554fe9de419f1cccd810adab59fc47c8431f53
font_01_sfnt_off000125c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDA 10252 bytes
SHA-256: 6dd5efa276ff63f1325214bd352b11665243839de7ba74b8ddb19eb102bef69f

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