Malicious PDF — malware analysis report

Static analysis result for SHA-256 824f28e1b22fb485…

MALICIOUS

PDF

85.8 KB Created: 2021-07-13 22:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 74378db0eeeee1ffaca26062fc4d8a84 SHA-1: 9644ae4da267c6a0f4b12afeccadc08f98a7a7ec SHA-256: 824f28e1b22fb485b2a3ffc90bbcc436868ffdb20886840105af907fa17a19cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bilalyapidekorasyon.com/userfiles/file/28543838695.pdf In PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/4c9d9f1801f610ac3cb5e06b2a5d4b06/tinomob.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/87474730384.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf7bed66ce6---tirebokomesivezi.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/xatisuxesogujobozujakegab.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c7fcd1f2c---24904073493.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/ripemepi.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/tarogedezotopubu.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70123235543.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2eac75e95---44145367464.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/zufusaxajapabejexivugoxiw.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210629105023.pdfIn PDF document text
    • http://konyaozgunmobilya.com/userfiles/file/mabebup.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/12573334449.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/midupofepibelar.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/17998709942.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c22d5623f1---40692164016.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/k573sftp245kc58ipm5p0h0c33/jigijijojufekoxajotup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=cartography+ultima+onlinePDF 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_off0000ea6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6E 18936 bytes
SHA-256: defee6f82643aabe72f46e5aafd395bd918294b14e33dc86949ec9bc8f5ec42b
font_01_sfnt_off000119e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E2 10776 bytes
SHA-256: e0a317966eba9da80e8c3fef20ac0668f34c254a7ede67e828ec4bc581c354b7
font_02_sfnt_off00013285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13285 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1