Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4fa78edcd11d839…

MALICIOUS

PDF

92.5 KB Created: 2021-07-16 02:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b392f526eece1156001f9df2bc32b115 SHA-1: cd46c5d43dfad39e2fb5bf6f8d87a255182a8661 SHA-256: a4fa78edcd11d839de31d210542bc2effa62ab457873b70cb1c9547c5b7c922f
172 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and multiple links pointing to compromised WordPress sites, indicating it's part of a link farm or phishing campaign. The JavaScript likely facilitates the redirection or download of further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/e07977d53e48b373470fbe6f2a3abc1a/56120517850.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/e2d805683b9bd4cb17d4121bb645e036/81312506256.pdf
    • http://www.77ice.com/upload/files/lakosunenagil.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16094655d7dc3e---runopenafigevaguz.pdf
    • http://longarmacademy.net/fckeditor/userfiles/file/46510242503.pdf
    • http://burnettefamilyreunion2021.com/clients/867108/File/50730667244.pdf
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/41869334769.pdf
    • http://lycee-elm.org/userfiles/file/nuvibabegudekuma.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a871dfb919c---tarafapuzasetanusexojam.pdf
    • http://dragonera.cn/admin/userfiles/file/zinisa.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6de0d8d1d---mekukoxosozekomexufajev.pdf
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/powazikibi.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be026fedba0---mukuxerabekapuwiset.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160892c6735722---mavozuni.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/cob098ci18vvsaqrq1373l28fr/lobugawefogewekexew.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/pc89jd2a5t4mosb05dsvcrfugn/3920027811.pdf
    • http://eprdel.cz/userfiles/file/lases.pdf
    • http://surtek.biz/image/files/20150108_034444.pdf
    • https://ijmscr.com/ckfinder/userfiles/files/negovokobekugezupumo.pdf
    • https://electroagro.es/pub/files/94546395507.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071a630eb7d6---toset.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd2d9c9c3e---toxik.pdf
    • http://cardealer-space.com/js/upload/files/wixorujenadusuwi.pdf
    • https://harkakotony.hu/UserFiles/file/pemiduwoxu.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079735810c5d---65686428245.pdf
    • https://zhansq.cn/upload/file/31781596915.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=simplifying+rational+expressions+calculator
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010255.bin
cc0ab9698743450a99f63d9778a9817a00c436a34a72f04c913bd34d08ae50af
pdf-font-stream PDF embedded font (sfnt) at offset 0x10255 11216 bytes
font_01_sfnt_off00011c9f.bin
6e1157be2d9187264030f6e152176ff67b6777cb6f6394bbfa6234f85c455ea0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9F 18020 bytes
font_02_sfnt_off00014c4a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C4A 16792 bytes