Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6e6e9a5c6b6bcc8…

MALICIOUS

PDF

82.1 KB Created: 2021-06-26 22:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d73da3bffa4ba673880826fa93d26689 SHA-1: 9c3baf0888a9886ac6195e522433462e0c9f9202 SHA-256: d6e6e9a5c6b6bcc887f3469977ae0798f11b4083008bfdaad9306154c1d4a6c2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, which are likely part of a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of a link farm on disposable hosting and compromised CMS uploads suggests an attempt to evade detection and distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c7f5eb409---juvujutisiwunegiw.pdf In PDF document text
    • http://health-bridge.in/upload/file/86092060724.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/8040881394.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/9395893840.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/luxixomisefilefiror.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/60337054787.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc20d9d26c---ranigononofe.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8965767cb---nelogutewotamevaw.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5763811cf---34524894637.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/rutefupodixotifenen.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608074358ace1---16450385152.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/amgai559pho9emo5hmbpv36pq3/19847195310.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a684d34e162---64263088085.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/mr0d22v30tsjidbt63dicvlob1/livubokepigamofenu.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/e1ea99a79886a20e8dd3a5022b15d5b4/mojejewopinelomusomodos.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/59b3a3ec35f02733741faf977b1484cd/pidirazupu.pdfIn PDF document text
    • http://alphaconsultinggroup.us/vpw/images/file/8300219616.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/97873908500.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/wigogopak.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/vakovopufikujinux.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e0fe448c8---56795768391.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/lotetikurijugotelasidojid.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/9248df50617fd40d4298929ec57793c5/29934641571.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/56596756066.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16079c19f323ed---78429518735.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/18011487787.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=ranger+bands+on+riflePDF 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_off0000da77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA77 18064 bytes
SHA-256: a258499dcced7a45cab887e279585e066c1e2821b8f4b5bfbea9d8d10f0d07ac
font_01_sfnt_off0001096c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096C 10616 bytes
SHA-256: 434f248e26e29958508a8738cda66a23aae1a3a9a6321d090d2584dc3ade0ad5
font_02_sfnt_off0001218e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1