Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8efc9033abe6714…

MALICIOUS

PDF

78.2 KB Created: 2021-08-02 23:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1b0d3ec67c957ea088af9d4fd87e2acc SHA-1: 56778ebcf13768494cfaad673576bd6629534800 SHA-256: d8efc9033abe6714ae8a4d528183c651998e5e1359c7f6077f1fe3872e6c92ec
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and a deceptive download button, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and links to compromised CMS uploads points towards an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=khanderaya+zali+mazi+daina+mp3+song+download+320kbps PDF link annotation
    • http://cristal-in.fr/userfiles/file/luzuwowis.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70bc5ba8fd---44313595437.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/dd81857fef4e8a13c93ada64b9b38afc/vudikelisalaxu.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a0276c9195c---japaj.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/nuvajuzewuni.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/jojavopifozumubud.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-7-13/20210713035741883475.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/molisenorusasipanarufam.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/e8e278cb27409216d563b9158382d409/91974847495.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/t28eoqbmjcvi5lagtascuirm3j/dudajelijinuz.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/db449c0027d7784e624a3005804b5194/judoxoxogafagij.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/jubajozexupof.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/jewevitopusanojowa.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/f48585ac23bd59287d6a27f85b2520e1/salelukabud.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210615_ACE189E12F40B124.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/rozagaxifozukafugitubip.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/40520304528.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/60523750361.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/9784919139.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62e107c60e---39138483706.pdfIn PDF document text
    • http://ausafe.net/images/art/files/83851487132.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/61ed223ce30e157b22052b480d5b7479/wukelap.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/19875570768.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_off0000cc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC36 11640 bytes
SHA-256: 9c6404a7ad113d31cd56a77576d309f4c0f6d809db3a80971c08b622e6d419e3
font_01_sfnt_off0000e74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74D 16668 bytes
SHA-256: a821aedc25d0d0d413dfe401b3da4ee36a56657f9f99a6c557c54a48e310df72
font_02_sfnt_off00011296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11296 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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