Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd12dca767badb5…

MALICIOUS

PDF

84.4 KB Created: 2021-09-07 01:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: d1379951baf5b76130e00fd6c465b3ea SHA-1: 411faef3064d4000bd566f4d8f1ec97e90abb615 SHA-256: 5cd12dca767badb51ac5a62aad28d50147224989bd6c9a000d12112a4106fb35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://martom24.pl/martom/userfiles/file/vuzezezezetape.pdf In PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/c58e771654e1d9b77a69212848266984/sififokaradawuzedisojupes.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/daxajamujovivuri.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/24401275926.pdfIn PDF document text
    • https://stopserv.ru/files/file/majawavefupezis.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/bozafadosemefiv.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6v1pbnrh52hdlbl6ig5tc1ic84/67649364624.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/fopidawotuw.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/6fc90161e90202a8e750882dd20c77bd/wabonor.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/knhmgr9ttioe1hrihtuvale542/81389549858.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607731ae5c4ce---19060173091.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/libaxununezoxenarawexi.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/86761585624.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/08174fcb772f3120eb41c981d9fccbaa/4248587290.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/pisudigatojezurifunaxadaw.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/8ou7imokq6k5tt7i5iu3r6h5t2/rubedatosalogasoji.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/sukodiwelipeluzosogon.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8414e3235---48488012381.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/jqloirfirm9odlel6ekiri2264/58191706411.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/9b9e81bq7bcdqjgaiuiuibuve5/53846747730.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c39e17907b9---zegoma.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/mizapusivibapig.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/riremifabubulerulew.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/senur.pdfIn PDF document text
    • http://teplospectr.ru/images/files/52965049552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=scarica+curriculum+vitae+europeo+da+compilare+gratis+pdfPDF 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_off0000e508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE508 11100 bytes
SHA-256: 0b219d2f19f5ae80584c6afda78ab93e31a60f473ae2622a93dbd8e05ead86cb
font_01_sfnt_off0000febe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBE 17080 bytes
SHA-256: c2b52149fa62f08529e2fa2f32bd93cd13d668cf15de6a57098f6753239c5b89
font_02_sfnt_off00012b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1