Malicious PDF — malware analysis report

Static analysis result for SHA-256 495dec75c7d9fd5a…

MALICIOUS

PDF

88.4 KB Created: 2021-09-18 08:38:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 900538f7b6733d5d48757566e4580eda SHA-1: a7ce6e63d12c82ad90dbcb6a7f4ac2aa3693c909 SHA-256: 495dec75c7d9fd5a9f7db8d6673daf07155890af745a64048bbc6b8ea35aab4e
204 Risk Score

Malware Insights

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

The sample was flagged by ML and ClamAV as malicious, with specific heuristics indicating it's a phishing lure and a link farm. The presence of a 'Browser install lure' heuristic strongly suggests a social engineering attempt to trick the user into clicking a link, likely to download a payload or steal credentials. The document body itself is heavily obfuscated and unreadable, but the heuristics and embedded URLs point to a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=free+pratiyogita+darpan PDF link annotation
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fb07dce97---86882949057.pdfIn PDF document text
    • http://bifruit.mk/ckfinder/userfiles/files/99385693167.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/tomenuno.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f86996671e---69375051235.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/58542800067.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091808252641156.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161368e62b9bef---69790420428.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/toleginowurizelibe.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/zunutisalim.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/bakigedub.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/sadaxat.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/nanodiga.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/wamijinaledetaxejirenar.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/lakagavetijag.pdfIn PDF document text
    • http://bifruit.mk/ckfinder/userfiles/files/jebefesalip.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/161454f494d186---53724517384.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/papaxevizonopiv.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/vexabiwabowupagobuxi.pdfIn PDF document text
    • http://st03.it/userfiles/files/52642525973.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/riveretuf.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/vajoxira.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/pifelokusut.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE5 22868 bytes
SHA-256: 3f50a58d861c5b30aece5d37948034b503be0199e6a75fd4178671462407edd9
font_02_sfnt_off0001266d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266D 16192 bytes
SHA-256: 126aabc53b187bc4421529373f04e2f66a11804dfeaeb35cb650b132d56c1dbd
font_03_sfnt_off00013c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C18 10444 bytes
SHA-256: a07d8dfad8b5bbd20df107c6a870e7b3678bf1d403a0bb7a047422557fb89f4b

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