Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f9939706060f666…

MALICIOUS

PDF

82.1 KB Created: 2021-09-03 18:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0f6b8b7b076a928a73e39f11343c3d59 SHA-1: 876d645887a3d1058a19efdcc49bfb4289b95994 SHA-256: 8f9939706060f6669aa8183bac57dcfab55e31554ccd81b2848de709c199fee9
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to various websites, including those hosted on compromised CMS platforms. The document body is heavily obfuscated and unreadable, suggesting it is designed to obscure its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://www.leasing.net.in/ckfinder/userfiles/files/69506726334.pdf In PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-7-8/20210708203049122097.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/gabasuzem.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/58437822678.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0efc47cd87---36369047907.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c427c88b1b---linawojape.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/98770461416.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/97980836173.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/mufafinufudenevukawale.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/57871479436.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/63094305340.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/22mrlabftij0mm5dr93kqrbbs2/nopajavopu.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/86734032310.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/q6dal50dfr26ae9uhd7rfm8350/87316842178.pdfIn PDF document text
    • http://skyline1968.com/clients/74864/File/58205393101.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612bf291c55b2---23184787983.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7163839f3---xevazejojaf.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc7f897e3a---56421901323.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/11303100485.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607f9244ad807---25854409208.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/11279559093.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/iaj3vu4temd3i57hvitm25avv4/wuwamilewo.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/tibovowavazob.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/1d899a9220d99994dfff638109566e28/13998038841.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/82376714df0487b4efa7cf46694396d4/xuvinoresasufokivoze.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/92e7255494acf07dc593b3e17aecece5/20527487917.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/vomuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=ccna+exploration+1+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/41da7fc89ce787757ad907ac2d4bea67/vakifogixexejipamu.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_off0000d98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98B 18952 bytes
SHA-256: 4f536757c37edc331c93b68b85055f2ca0d6c77ce39dda4c5c12347e0277173e
font_01_sfnt_off00010a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12269 10628 bytes
SHA-256: f19da33ea3366113eb61c51d0bf5625ecc3514ae50300cab3501e81681c19f08