Malicious PDF — malware analysis report

Static analysis result for SHA-256 8816a3504b5a86ba…

MALICIOUS

PDF

88.1 KB Created: 2021-08-08 04:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 70a7b5baa483bdb2430bc0518ba9ef7b SHA-1: 0453b9956ff1ff4b3da36ae81c7a1fc3c5661047 SHA-256: 8816a3504b5a86bad6afa84d0925a4dbc99faa4cee38062281b3915d1cbac8cb
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 0.9994

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 http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fbd9ee3d13e---mufajedisukixenal.pdf In PDF document text
    • http://provia-events.de/pics/fotos/1/file/82306693355.pdfIn PDF document text
    • https://olterus.info/contents//files/27382831924.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/lvgtlr14jrlk1gkumkp82ph6gb/dofujovemefoluxiketi.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/zofabeje.pdfIn PDF document text
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/sowegaxadepumidapefed.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/22143096574.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/luvudo.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/38092318621.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/siwezupaxofasabosip.pdfIn PDF document text
    • https://nilsagame.com/calisma2/files/uploads/jigijaxovewogivuvejuni.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/melabunewafimavutifosi.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1b7ed0d77---48750082159.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/99212939026.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/51463924902.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/xirififenexebozen.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/22066758544.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/govaxilisotudel.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/35688302559.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/3827eb678eb6478a45292432f66189bd/97156485821.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/15546056585.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/1745587866.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=chinchilla+shelter+nyPDF 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_off0000f3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE0 10352 bytes
SHA-256: 1600d15488f5b54789363910464ff4a239da30a085e0f03c8e635fde097b47a4
font_02_sfnt_off0001233a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233A 18044 bytes
SHA-256: 0f808eb90446a1a9856c5a4fddaa3f7455138ecbc7a6022337a15fbae994f117

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