Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3736eeadce60733…

MALICIOUS

PDF

79.9 KB Created: 2021-09-19 08:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e94487c9916e6d8fffbcc4bd7788bc8c SHA-1: 602f9f5e782dd2f3505b9472f5d5b97a7c9f5994 SHA-256: c3736eeadce6073332dafa41fba8c1580aaafca2777ae9cea9f3ab0c84114a21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://irlanc.ru/uplcv?utm_term=sw+maps+apk PDF link annotation
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613924a7bc73c---51203979262.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/zuvosax.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134970441028---93801430303.pdfIn PDF document text
    • http://telektrans.hu/editor_up/kebotal.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/wuroz.pdfIn PDF document text
    • http://artediapharma.com/upload/files/sametofudulovizoluxupara.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/jajawu.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/gajukanabe.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/44972090712.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/13980979523.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/38430390989.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/31871300425.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ab296ce9d---5713688862.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/zusazotasiravo.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/famikotusiguwukapenifuvi.pdfIn PDF document text
    • https://cargotavio.ru/files/file/neziposewomibetixusexiwo.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/vedolelukalazepegegewabim.pdfIn PDF document text
    • http://effektfilm.de/files/file/lajuwafesepur.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/bibul.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/38328885968.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/76640999532.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16142a39703870---jakefo.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_off0000d632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD632 17664 bytes
SHA-256: 5356a2c35aa0240db30d0c3bc729a9c9a7d2f61c353624c841d1aac26414616f
font_01_sfnt_off00010463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10463 9972 bytes
SHA-256: fd61ac11eef177111d2c052c5f2899b4b9bb386cd3741b4599267f0033220958
font_02_sfnt_off00011a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1