Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bad087c9adff493…

MALICIOUS

PDF

89.6 KB Created: 2021-09-05 12:21:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 32084f8a8d103566009ce7d977ec4d7e SHA-1: 082e99dfb35b3c83ba13568bc8c5e480dd8a5f68 SHA-256: 8bad087c9adff493470d98110118fef72efa86ac869959dbf3a1a06594dddaaf
164 Risk Score

Malware Insights

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

The sample is a malicious PDF, as indicated by ML classification and ClamAV detection. It functions as a link farm, presenting numerous URLs hosted on compromised websites, likely to trick users into downloading further malicious content. The presence of a 'download button' heuristic further supports this phishing-like lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • 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 http://amandamaitland.com/images/file/fusokolinug.pdf In PDF document text
    • http://adaviestransportltd.com/userfiles/file/69219072503.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/jumoluriwunow.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/aol7qbbldv2rpbfjgvb3sof62j/81477629891.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/29d08485a257eca08d46ac06d4c1225b/mibasemotabolenozumalus.pdfIn PDF document text
    • http://fxmeat.com/upload/file/f9a765655c826cb5685b7c0d5cf72a13.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/gujupuri.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/2d74c9a78cb83da5c247d5d6510cc779/morati.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d6d84fa51---zurorujigisigokovekes.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/duvififevisulipaxu.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/kisijamulenakege.pdfIn PDF document text
    • http://chicopharm.com/upload/files/37837060356.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/10584900641.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2e9d57379---setetibunukaxog.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-8-16/20210816193418180407.pdfIn PDF document text
    • http://francisfamilyreunion.net/clients/870293/File/pijanolafid.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/guwag.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/pawanuk.pdfIn PDF document text
    • http://www.toptehnik.si/images/53047540464.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/lslcveke5mu13d6ml7g398l5l2/zovijudefoxusafu.pdfIn PDF document text
    • http://fedoro.ru/upload/file/pefugal.pdfIn PDF document text
    • https://arredamentigiacobbe.it/file/dakudorokokunive.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609106e431fad---poganubunerezumupukepeta.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/sokotot.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/b8395adc4356771452371882a47ceef6/88129100512.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/xiluviwasuwepefesimipoxe.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/8e9e970b84096c7db93c6f83f032fea3/38450386395.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/bodotuwun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=year+3+maths+curriculum+worksheetsPDF 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_off0000f919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF919 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001112b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112B 17820 bytes
SHA-256: 79a90ecd203a31fd56b582a7288d09a7bfd3ce8659845a6e32f04a35d3a79bb4
font_02_sfnt_off00013f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3C 10824 bytes
SHA-256: 6c3598f22db019d44675a440b8e280dbe5bd09170ecf48a61529c4b047746149