Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93614c491896346…

MALICIOUS

PDF

80.1 KB Created: 2021-09-16 21:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 62eb6e0e7180807466e2febd1237589d SHA-1: 9ba2735c26822631a4b3b565b31977f0c0f27f22 SHA-256: c93614c4918963464674f8a7df979f4223ea20cd5eeb9f5430f33b9f7689732f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics confirms the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://allytemp.ru/uplcv?utm_term=android+phone+storage+space+running+out PDF link annotation
    • http://aalzkj.love-mrt.com/upload/files/ramadetusulukubikekujik.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-6/20210906135357186907.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613de4cb67bd4---rakogopolujuzelob.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/ligomofozegod.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/3185749738.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/70601640755.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/64799614519.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/23723126951.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/rewesukiderawefamomivi.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/kamumuruji.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/polumidogakulotivosur.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/58494001444.pdfIn PDF document text
    • http://cartopack.be/Images/file/zikigof.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/23416154815.pdfIn PDF document text
    • http://www.depomatrial.com/file/jadidi.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ufjgip8r5rmgc37e18oj7nafu7/wuzamunepajan.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161364b791038d---dewabonipumumefokiralid.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/pajugasewalaviw.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/41435326235.pdfIn PDF document text
    • http://synhbio.com/upload/files/5684253645.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/pezaturulobumi.pdfIn PDF document text
    • http://hasyo.net/files/file/40791900588.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210912021002.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_off0000d389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD389 18152 bytes
SHA-256: 7bb2532a56b3eaa984f8dbb949f5b60810950f7a01ae0f72d02fed0c8aa907d3
font_01_sfnt_off000101db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DB 10828 bytes
SHA-256: 2fee8b19780bbeacefea22d5ae5f03a52eb97c4a3e7cc22ef6ebe63ee6343e44
font_02_sfnt_off00011a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1