Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffbc7f2523fce1ce…

MALICIOUS

PDF

69.8 KB Created: 2021-09-25 07:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 06ae0c0a5201837b15880fc0c1803f52 SHA-1: 7045a2cdd04f9bea4f3c917e39956b72df6eceab SHA-256: ffbc7f2523fce1ce5004c02a66d6dd36d899e75e500bd439f5c2bd9fafefac3e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript and a significant number of external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The presence of JavaScript and the link farm structure suggest an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=android+interview+questions+for+experienced+developer PDF link annotation
    • http://ammk.sk/userfiles/file/94170105354.pdfIn PDF document text
    • http://apart1day.ru/file/78780176386.pdfIn PDF document text
    • http://africareview.in/userfiles/file/87381172397.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16141170b4d121---jutajigezitug.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/91532530751.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/ligasewenofidisew.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/ruwizimozete.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/dowog.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/naxezizo.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/6445111752.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/24957842758.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/53130547263.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/14385401753.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/19101939561.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/98206497619.pdfIn PDF document text
    • https://carlojans.com/cms/file/67263219677.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/nudebowuletukizubevo.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/wuwonopegewikejibu.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/dikomagogesudabewixubame.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613de8cbafee0---74254263292.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/5353306683.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc135ed18d---lemuk.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_off0000ad82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC599 10932 bytes
SHA-256: fbe3eed228eed14c7077729bad639e5955270a8cea2281f08b2ea4c97a716644
font_02_sfnt_off0000dee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE9 16864 bytes
SHA-256: 39d808c04bc017167d5dbaebec981489d870ed1826527f6cc6233fb1e35bf8a0