Malicious PDF — malware analysis report

Static analysis result for SHA-256 b48ab788623311fc…

MALICIOUS

PDF

80.2 KB Created: 2021-09-20 00:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ec8a69b341e2be22959262449c7bad49 SHA-1: 678fb028521510e09a1fc5599e18f5b079fc8295 SHA-256: b48ab788623311fc0ef5acd8683cda77454a9463780dab834144bdbcad0c6cdc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to potentially compromised websites or disposable hosting. The presence of these links, combined with heuristics indicating a link farm and potential QR code lure, suggests the document is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/1f4caa27bdd626652114476300a206da/32074362705.pdf In PDF document text
    • https://techlan.pl/files/file/jagikuzagifesezekal.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/76576ce7b6b5ddc06da146b3a7088c40/zuborujinazeda.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/bavanosopikawevumup.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/58219024332.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/vufotakisonuzidera.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-17/20210917081734259408.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/dexibep.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/vupebi.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/ximuduzedeka.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/xovubewofag.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/faxetaxokuga.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/sijegivepikol.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/39052964346.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/dd45e6f299fc1c3bd885604dc33b5fb4/vilafitijeginesujife.pdfIn PDF document text
    • http://goldmustang.ru/files/files/58116387189.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/wadixezajaxaru.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/18086893403.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c7e4229a1---jawozave.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/sajosixuwififitinoluzedu.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/redetujuko.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e86ccbe2ec---55108067343.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+find+saved+wifi+passwords+on+androidPDF 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_off0000d0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B1 10588 bytes
SHA-256: 32ae89031149a5a14b2c2fd3b87da74be61ef35afdae5534278b36ee07964ec5
font_01_sfnt_off0000e901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE901 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10113 19100 bytes
SHA-256: 0d749cb0f73539b7c3035724a2215fccaf21f6325d093563cd8f23c8d5eec018

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