Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af64e96ec8cfd0d…

MALICIOUS

PDF

77.0 KB Created: 2021-10-04 02:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4954115a9eb7d4b42d2f6e7fc04042d8 SHA-1: 6d6499e4fbd832281d9378ca5bfc2d8163750ee8 SHA-256: 5af64e96ec8cfd0d7d7ceff5af07f2a95d16c451c493948d7c5b0603df6cb252
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to obscure the ultimate destination. ClamAV and ML classifiers strongly indicate malicious intent, likely phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9757

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.naabelectric.com/userfiles/files/29928129910.pdf In PDF document text
    • https://rajaketiga.com/contents/files/xawedinep.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/82277562040.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/wanofibok.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/dufipi.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109291645189133.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/dugewakaditasegogegezo.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210918131139.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/39027180109.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/5c30c792efa09b82aebb719ea35bd6c6/6182505039.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/guxivuwazovux.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/5e4a1c71038a1d14f038efdb50b60a8b/kekubewuwepapezak.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/edf5d9t6q69obpolohn9uccq03/90873312471.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/161327eb4342d2---13052888816.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/xivowasavi.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/aa9d809db5536d419b267cf6631178d6/farire.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210928_54F19DDEF8B1CFC8.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/97957142207.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/68600830738.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131276e3138c---busaguponepusasimuwig.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/97946535174.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/vip1o2ut0qjejaf6se4d8nqnkk/55900455229.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/kemagulepoxuninolulajemi.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/7927705256.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/18732201522.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/69942958274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=9+pounds+9+ounces+in+kgPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCB 10548 bytes
SHA-256: 9aab61ddd069ef3a9de42929ff518196dbb3656be1b24aec2bb9a5cdeb3d19a3
font_02_sfnt_off0000e4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B5 16716 bytes
SHA-256: fa230b96895027451d9f9621972597e3a22ebb6ed56f8546e62ec35988089255
font_03_sfnt_off00010f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F71 16320 bytes
SHA-256: e762d96c56a2ca26485459556cb62a4a366a672c9aa93e8e7ca0071c315cba19

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