Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fa61d7ab60b6a41…

MALICIOUS

PDF

69.4 KB Created: 2021-09-29 12:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75039228358b7ac5c420d490a6f16b0a SHA-1: 585ee5d2a5a4846e7b7fb4db4080e4e292beb405 SHA-256: 6fa61d7ab60b6a41f170485dcd5e97f68e0a1ac235a65dba6e92811761684dbc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, with the primary lure appearing to be 'free movies download'. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=123+free+movies+download+online
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/kbtrupglk1a1799vv6en98l2n4/25155317551.pdf
    • http://terezszilvia.com/images/uploaded/file/39690657662.pdf
    • http://igabana.com/upfolder/e/files/20210918194544.pdf
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/jufulubexaxolavunufupa.pdf
    • https://imihwa.com/uploads/image/20210902/files/20210902215107.pdf
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/morajenomo.pdf
    • http://andrenickels.de/ckfinder/userfiles/files/kubipa.pdf
    • http://dsacare.com/admin/uploads/file/fitobigajiw.pdf
    • https://curtain.jinware.com/upload/files/pomisizope.pdf
    • http://15881588.com/ckupload/files/28918209118.pdf
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/32131218324.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/rk27s0llqoufi6r21gu8ms88r2/mepikifukajubutebinid.pdf
    • http://dlevitin.ru/fck_editor_files/files/66353348868.pdf
    • https://consurs.ro/ckfinder/userfiles/files/dugepizujedoru.pdf
    • http://0851gay.org/userfiles/202109file/2021091104485070554.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/99fd9a856b84f6768de0245217383a94/zofikekozowideduxi.pdf
    • https://songhongresort.com/img/files/90856345943.pdf
    • https://mimpishiosatu.com/contents/files/22383052111.pdf
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/99889538251.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342720ddb7b---2054071464.pdf
    • https://granitabrasive.com/editor_up/91343695838.pdf
    • http://betheaskssd.com/flash/betheaskssd.com/file/fuxivolojege.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613444312d532---90282202770.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aed6.bin
4c8de80095713a8eb07398317d93ee5d5ab3576dc6225398834e94e4cd3db9ea
pdf-font-stream PDF embedded font (sfnt) at offset 0xAED6 15140 bytes
font_01_sfnt_off0000d542.bin
7545623a393b3e51e08c4f1e7dd005116beb105dbe8274a38fd2349a46840396
pdf-font-stream PDF embedded font (sfnt) at offset 0xD542 10816 bytes
font_02_sfnt_off0000ee52.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE52 16792 bytes