Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a5ce600d04e039…

MALICIOUS

PDF

70.9 KB Created: 2021-09-08 07:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0b09581a00a81711eeb657367effea9c SHA-1: 6f34c30fa9855d638f0c25790352948075be689e SHA-256: a8a5ce600d04e039f7d57efe15634ee38f76750a9a32f5a6c7a293650df10020
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://fotografiafrancescosomma.com/userfiles/files/60196694315.pdf In PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/b1534c01e3090d207fcdfaf401185088/64101195285.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/60225886970.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b1044410f---962450297.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/6959643893.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098db15a9b5f---xekep.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/35335967230.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/46306692016.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16088599813f88---ladanurawiwutolugukez.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210704184236.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/70589342390.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/h77c0ec4vvt3os1as0oiceofci/butawugejibepi.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afab1f6f1bf---kijibovifapoxodivunogejov.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210804_016F375F84A7DC54.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/sagidadiweposegap.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/690b62f86a2d52ed39b62257be8d2895/xawojaxefodexozeda.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/moe8kviamrgvcoj46j263kjrts/tododogadolozevit.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/nuzagomokevejewitegaxa.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/fojakapowozezejow.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/77897410467.pdfIn PDF document text
    • http://webmenuplus.com/images/file/kukeb.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/3caeadbcca87f682ac3bf32e082a5c30/7550257582.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/50138911555.pdfIn PDF document text
    • http://ghemassagenhatban.vn/Images_upload/files/87493187734.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/8a755b2caabe40cda4458cf8e455798d/90914204905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=cbse+science+book+class+7+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_off0000b6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F1 10728 bytes
SHA-256: 61060f3c3ea4d62d47e1084773b33eaf54151b029e686d7077ad6bb079beda3c
font_01_sfnt_off0000cf83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF83 15236 bytes
SHA-256: e7a74245fb7648b449b2a274641d50dcb8b80a018ffc1b498f2c6a8916119b68
font_02_sfnt_off0000f634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF634 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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