Malicious PDF — malware analysis report

Static analysis result for SHA-256 2281fa08688085ac…

MALICIOUS

PDF

69.2 KB Created: 2021-09-16 10:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 15f8e7f36e9187349e5972b9ae7de238 SHA-1: 735c218c36c5a0bcd9ac03f770f6d165f8b85ccf SHA-256: 2281fa08688085ac626149f702639d08fe216bf6c8afbf5dab4e2fdf6d95c398
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to external websites, many of which are hosted on compromised or disposable domains. The presence of 'utm_term' parameters suggests an attempt to track user interactions, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://philabc.ru/uplcv?utm_term=iphone+11+plus+price+in+bangladesh+2020 PDF link annotation
    • https://zebcom.in/userfiles/file/dorebasereded.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/56550946510.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/74105617967.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/sadilafotubovilujire.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/xezejibubur.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/22176547836.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132c73a6ef1c---450168156.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/64476946783.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/12443697125.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/68052421570.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/78000236924.pdfIn PDF document text
    • http://devison-matras.com/upload/file/53155543381.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/57966736262.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/jififidanijalefiveso.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/kulojagoxowojukijesilosun.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/o6d1508mqsv1j44q6r30j429ho/15247020516.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/7df7d88b353fd463dcb30dd61fcebe5b/88007882621.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/59259117060.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/fasezok.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/95218546750.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/96930299356.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/sunavumutulenerujopo.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/wijagibikebitoxajesulun.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_off0000b1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D7 14132 bytes
SHA-256: 96a934105704eed22c0f85a8d028cc90f0173ac788bf0f672705c3083c712036
font_02_sfnt_off0000ed09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED09 11180 bytes
SHA-256: 1557647a1557ab4ab9bd876e9e435186e065712540bc45b8fff37de5f096b881