Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d11e4a9937b2d91…

MALICIOUS

PDF

84.1 KB Created: 2021-08-21 23:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3ce7c01d155e9e06a92a0121c7f05d95 SHA-1: 047e95b1fcaae865d2e3d260a28b65e7454dbc45 SHA-256: 8d11e4a9937b2d9129817f3057acb8de21e268676ead007ed90b6f93b6c73fe6
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which are part of link farms on disposable hosting or compromised CMS uploads, suggesting an attempt to manipulate search engine results or distribute malicious content. The primary purpose appears to be directing users to external sites, likely for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=autocad+2014+crack+keygen+64+bit+free+download PDF link annotation
    • http://arcomproltd.com/userfiles/file/78313361853.pdfIn PDF document text
    • http://sitepride.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/vufejelogoxijovi.pdfIn PDF document text
    • https://italvaping.com/file/6094738655.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/kunagelogenigufel.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/416666104.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/kovigosud.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/rinofovafixug.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160777333a8be5---weborixubutelabusib.pdfIn PDF document text
    • https://pisangmanis.com/contents//files/nozofilidaxuvamudusa.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad84f0df8df---wimefupodepotosurud.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160776cbf2619d---sufixogafazevumogap.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/sizosawev.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/1621b533f1401a83df1cc39f1cf5a019/zulobumakimejesomebitipaw.pdfIn PDF document text
    • https://nasikampung.info/contents//files/58953483497.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb385645da6---28456732283.pdfIn PDF document text
    • http://budropol.de/Upload/file/30181466220.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/12973330403.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/130700509172.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2a6f8c8a0---lutavirozo.pdfIn PDF document text
    • https://akemi.ro/hirek/file/75580339064.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776e94f068d---boxosepolatatozi.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/16520951318.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_off0000df72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF72 17468 bytes
SHA-256: 5ddf29eb8568c5bd83d0152a3e8939c50ce7cf35f3396cd814ae85e9f441fbe9
font_01_sfnt_off00010d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12579 11536 bytes
SHA-256: 7d5026aad014a7a5cb748b580ed17c92571959f10953e557d374a348140c3646

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