Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0cd66cc20623d94…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 17:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b82c6f0c2c34f7d8db206f0b45b65abe SHA-1: 5863fd2036a6d72ae61de7d226a67a061a0a6ed1 SHA-256: a0cd66cc20623d94d19628e11bd72a984cc9ed229fcd74faae26db625819faad
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as compromised CMS uploads or hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on potentially compromised infrastructure suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/61081142003.pdf In PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/todesefetifosenezesot.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/sedivotuwuluvivukadedon.pdfIn PDF document text
    • http://toroisg.com/public/images/files/majodexazux.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b76ae0e4c---zadomerabotobilemagimere.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/60296280917.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/75775710839.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/12197012594.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/jeratusudikawosomavozol.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/46388559599.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/93549259786.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/xijeruzesarumufume.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/pilerulenurosidulabiruja.pdfIn PDF document text
    • http://ijfbn.com/editor_up/18351576417.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/39280258074.pdfIn PDF document text
    • https://porfic.com/fotos/file/44183173652.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc07164e46---1611492635.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/45478217025.pdfIn PDF document text
    • http://state-lithium.com/upload/files/bobiwu.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffcc340073---18604417652.pdfIn PDF document text
    • https://nomortiga.com/contents/files/83058628640.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=tom+and+jerry+tales+moviePDF 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_off0000d6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C4 10680 bytes
SHA-256: 4ce36465fc493b6f3f43449d38688944bcab16f08526f54d7ecd2621d60fb436
font_01_sfnt_off0000ef3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10750 17564 bytes
SHA-256: ff2d03ac4cb666c95c09a918b40ca977bac7d8e8411ec0f4e59c8705ebdba3a6