Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff983b123f2ef05f…

MALICIOUS

PDF

92.4 KB Created: 2021-08-08 17:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 261dce81e204b4260c4ce7dcbd963009 SHA-1: d76f3d35ac109b84378a0e5b253175896ab4c930 SHA-256: ff983b123f2ef05fca35565f209148357058f7f7ba24e131492258db103510e5
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • 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 https://allytemp.ru/uplcv?utm_term=how+to+set+up+a+garmin+echomap+plus+93sv PDF link annotation
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/3005227a7d876558980c563e7e7bae1d/85486000436.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160abb194e7ba0---76025545769.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/240052088916.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe6647d9a7---zabiruxufituluronip.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16085f9587aa98---wefeda.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/musulemosusevomarotazox.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210808_183032.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/lepotipikotilogipikifa.pdfIn PDF document text
    • https://wipaphun.com/UserFiles/File/3590446771.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9478e9615c---pidadarikubow.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/0575370c8cd838aee43c4bcd92d06a9d/rakirujunogakamulo.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078445e2b030---xojerapirokirapupud.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/71323303325.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bc1bbef2a---gajixamiragobimapojisisis.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/8889531370.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/unhv2a44j64md86aognrd753ra/26038207017.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/99501015767.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0d77536b4---27929019977.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/dizamumuzaripefike.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99897169926.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e6953889f---8489694464.pdfIn PDF document text
    • http://ropesadventure.com/d/files/zorawogigafalewim.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e66a50ce3---gumanofupadinetipawuka.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/3b622f75b8d88ebfde53240b92d7dd67/85353762444.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/51753641486.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_off0001032b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032B 17304 bytes
SHA-256: 59605c427b513a21e468e0a0c4878f344a8beda71535f38a45c02761514ff500
font_01_sfnt_off0001307c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307C 11404 bytes
SHA-256: 23d0e3f634d4d797510a40e84d797677330ab5de9411e7ef5d77e6fbbd58bd3a
font_02_sfnt_off00014b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1