Malicious PDF — malware analysis report

Static analysis result for SHA-256 e68ea21558b3b850…

MALICIOUS

PDF

80.6 KB Created: 2021-09-08 17:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d918d6ec4303fa0867785fca800d2180 SHA-1: c041c46e77e5448ebd9f7b67d5e87ca40d5433c2 SHA-256: e68ea21558b3b8507c13953c9b42fa2af2626b6cfe2af79c0195aa2a30af9d3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://stlnsk.ru/uploads/file/donerafivovemawadedobo.pdf In PDF document text
    • http://davcpundri.com/css/file/49301601032.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/pokivifivoriromijewa.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/161342f8ac7b46---52026397099.pdfIn PDF document text
    • http://vaithun.net/upload/files/wimoj.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/6931033319b15a8d03b0f1c30a25a036/14692425004.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/bedole.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210905060258.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/34769540877.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/dodemota.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/78400398006.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/0d4c191ab31f1412cabcc62789386472/gukibipa.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/zabixuxiwazagunoxujilak.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/lexejagepexow.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/87005385353.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/67099835869.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/85106313622.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/bubajobinuvemotiropaga.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/43883830340.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/wagexugubege.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/9497601508.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/bowaza.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/pabiforivazoz.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/98251298860.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=traktor+pro+2+manual+deutschPDF 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_off0000d47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47E 17964 bytes
SHA-256: 1368122cc70011b58f841d9ae6f8c8c05ad7f5734c7831daf5f9e40d0da0b667
font_01_sfnt_off0001033f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033F 10960 bytes
SHA-256: 46e3d4094e4ae22e8f5d4688101cc4b6e68868dcfb47281fa48c72e9fee0c59d
font_02_sfnt_off00011c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1