Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fbc156f337a93b1…

MALICIOUS

PDF

82.7 KB Created: 2021-09-13 16:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 25d6b3fd3939c74bfeaaecf36319ab9b SHA-1: 022b3eb7879c764107234c2a7f1422b4105220cc SHA-256: 3fbc156f337a93b1dbec5576f74bf8edec58a09b2409f2720a3e491dd4dd7179
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous external URIs were extracted, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the PDF's structure strongly indicate it's used as a lure for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=all+dragon+ball+games+for+ppsspp PDF link annotation
    • https://airflow-skateboards.com/upload/file/34912050561.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314cffc9698---79680209674.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/27ed6ac281314992b1c7164bc7f197a8/suxivevidikeje.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/zivitelogoxewubur.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/tubasavuxen.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/82861960197.pdfIn PDF document text
    • https://phunhai.net/upload/files/42682066329.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/tijijenubiwuwewobex.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/71854712266.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210911_230926.pdfIn PDF document text
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/71651492540.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/161309512127cb---besekasidexizizuliribuz.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///54990816556.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/ripebeloto.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210909230417962549.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210908093441.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/37158063927.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/13793104334.pdfPDF link annotation
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/1eee6350e5a31bfb7238a92a91ca62f0/69635762001.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/18093541853.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/12234065951.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/todigelozog.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/85576499753.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_off0000dcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E6 18536 bytes
SHA-256: 148f01192ce16996c9de7c54fedfb9cfb546dda40f0940f33c88ada4ec969d9c
font_02_sfnt_off00012470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12470 10772 bytes
SHA-256: 66f5ef2071c04fff50f3f35076aa4aab9e48e8e7dc2dbf52870c39475592f20e

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