Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a3280f22298eb84…

MALICIOUS

PDF

94.8 KB Created: 2021-06-26 22:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fad19fcb4c8934c4dcba08b6811f10a8 SHA-1: d16462c17327d3996b1b535bc65195a223656178 SHA-256: 0a3280f22298eb843eb865ce481c881278c0eeb346ab99fb3f447e040950d0be
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the link farm structure itself is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://mintowncoffee.net/uploads/images/files/27117478804.pdf In PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/773f1a70aadcc494554ae3022591fbae/96328945060.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/jofoxusefoladoje.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/39289703957.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1608116135d3ee---43989162172.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/xudenulazufivevifarusixi.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5a4b55991---23653860506.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/a9bb4fef868de66738c500bb08afede7/7452924831.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d9a7beb12---wojuboxo.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/oja77qb1dogi61l05rp5jo4t57/12594569307.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/duzavimokokijiroxuvi.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/39781225357.pdfIn PDF document text
    • https://hifi-markt.eu/kunden/kronhardt/ckfinder/userfiles/files/bafuvirekerazil.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b9cb174990c4841ca1a7b2b1503c63b1/kipijawuwesokip.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/94634651671.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076441694d33---tegemonejosiki.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/16806577053.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608236e84b8ad---pigegigajotakorunegasojex.pdfIn PDF document text
    • https://brod-plovdiv.com/images/12298272170.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/28314354235.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16076229c5c553---9471860580.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+make+a+minecraft+server+lanPDF 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_off0001106b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106B 17168 bytes
SHA-256: 948c4461c130061233243d4d0d9fd43aef2450ae6be5efb628ee7c2c77939a56
font_01_sfnt_off00013d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D41 10732 bytes
SHA-256: c9d7bfd711d51c31697cb99f0e620c15d60e40d775d47b3c793cc6e9d14f94ee
font_02_sfnt_off000155ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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