Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1bddc85c21b626…

MALICIOUS

PDF

71.2 KB Created: 2021-09-26 03:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ee32d51202aadcdce15423e129204489 SHA-1: 98d17a42841662f61ce9996ea43685f8eab82247 SHA-256: ab1bddc85c21b626ef168671508c9ec0bdc727bbd1b09772c2471a7e22e237e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to websites that appear to be part of a link farm or hosted on compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL distribution are indicative of a malicious 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 https://huntic.ru/uplcv?utm_term=top+10+games+on+android+free PDF link annotation
    • https://pspgenuine.com/ci/userfiles/files/9085935532.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/91029086320.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/kugakodarop.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/lomotirudegemajokezegakem.pdfIn PDF document text
    • http://sartor.ru/upload/files/zozisafesivika.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/penizakiloderowam.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/31273843793.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/kinivoja.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/pelowewilikos.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210921_7734907007E2D7C1.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/34577069250.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c92d9477d---vimujavek.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/juwedazetamasikupopak.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/84224794959.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/161339480a208b---wekolefozumunizebar.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/fesoredameloxewan.pdfIn PDF document text
    • https://theipbuzz.com/images/file/zatuvobesuloveneke.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/6511598238.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/bomavewute.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1add9a8cb---filiwefexonadeb.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/sivanuxuzibolizezob.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/46673987163.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/66424913370.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/vifozuxemoribatorolixaw.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_off0000b329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB329 10832 bytes
SHA-256: 0371b5f9ae2c491740c03787852fec882630d532140951174106be8b1d96d212
font_01_sfnt_off0000cbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF1 16988 bytes
SHA-256: f36c27e758e5a32d0801b1fe355c52ea5b638cfc5563f34404c99663096fdd8a
font_02_sfnt_off0000f6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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