Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b2357a65ff43955…

MALICIOUS

PDF

85.5 KB Created: 2021-09-04 08:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c285c3580824f2abbeb133c62bddd6d5 SHA-1: bed110f32f72285d36c93d7824c1167ca815f119 SHA-256: 0b2357a65ff439559c4b5be97304e0a50f0e7ab9e54c7301b0484edea1394f19
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised CMS upload storage and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ag3r5k7bbgmigbimh0equj8fc0/nurixuzedutopu.pdf In PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/b2ra43abh2u9i1dpr3rt6jloku/64128698514.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/vokuzexoxazaxa.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16116f8c949467---vusukebuni.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/65333190170.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/jup006gbg6m9gh3clequjnqcco/musedisifefobivatetuxux.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d07db8fdf0a8c26d7efc0e1a2ea03bbd/60062854062.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/farelopuji.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/64065847709.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebd11e8c64---18700262204.pdfIn PDF document text
    • https://cet.sk/res/file/5148580091.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/a9d15c6472fb1a92822564a97fdf91fc/85131469518.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/mepafifasubesikamusezus.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/69659aeff50cc9eaa5dd41ff8088c343/mukabigafotolofativavilem.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/76871695364.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/02cfb9a3a322411946a42d47cdf1a23a/zebutamariku.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/wexubugijeg.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871a1680e94---20498082444.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f35f2e6c05---66134879232.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/5322293168.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/karededakuzesifiponadupiz.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/59241374721.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/92951874174.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/sagilivozojuneju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=what+does+manual+means+in+spanishPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC402 10652 bytes
SHA-256: 0aa4201f7819c8aa313e3d88de6030c8438a2611d80e8efc90f91cb798799d2e
font_01_sfnt_off0000dc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF442 16700 bytes
SHA-256: cb5a4832b84f2f0517fd51e3b58a368e14faf33a11a90203e9e455007e8973de
font_03_sfnt_off00010c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C09 22992 bytes
SHA-256: c3c542b86ad0d9f6cd90f1edd2d0a09bee11f9b34c299713eb8ff2693b97640f

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