Malicious PDF — malware analysis report

Static analysis result for SHA-256 62bfaa18d6f0d326…

MALICIOUS

PDF

84.4 KB Created: 2021-09-16 18:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 568e10f0d60beb9224c40c50e9bea495 SHA-1: e7a7341025c970470fbec26498fb8351d8b8245b SHA-256: 62bfaa18d6f0d32647b41b1f02c7495931345f0533628127559abda097baefe0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=can+i+get+a+call+recording+of+my+phone+conversation PDF link annotation
    • http://hotel-ambassador-nice.com/upload/files/57371916897.pdfIn PDF document text
    • http://advairtech.eu/assets/userfiles/file/notugepegep.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/9129646484.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613198897c791---4310544869.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/878e29f57bedc0f7b20b9084a515d563/64433487828.pdfIn PDF document text
    • http://remont-m.com/userfiles/file/78554885253.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/161379398bce05---92378748070.pdfIn PDF document text
    • http://yilip.net/userData/board/file/74216518562.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/xeledisidu.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/tinewodusujigamamajuno.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/defegixorakanuwoz.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/22480711921.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613629d5e0197---76284402915.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/42146653721.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/74714340825.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/40990636758.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/89534745856.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/28699770741.pdfIn PDF document text
    • http://wixoon.hu/upload/file/92720182594.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/sumeluvafujakidugi.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/nefumumuzumij.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/majuvapoz.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/gapilokutuposoxidowexeg.pdfIn PDF document text
    • http://oilspecchem.com/files/gifugezutim.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_off0000e1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EB 18144 bytes
SHA-256: bcfd704ce9385e7ba61f94f688354b3e267cebd5a5402d0b8f43cb3065bb4516
font_01_sfnt_off000110e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E3 11276 bytes
SHA-256: ae9cdb2137ea7de86154cea38e561a291716219f71cbb49be9ba4fb396b44a09
font_02_sfnt_off00012b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1