Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc4f7d4b68a5268f…

MALICIOUS

PDF

70.4 KB Created: 2021-09-03 07:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fac8c20770c8a1453e770b714d5d6e17 SHA-1: 8111306f3b7a685814d11e3166bf267bc65feb77 SHA-256: dc4f7d4b68a5268f37c6c12cd4bbd3e5212990120db24a887c8f4a0bb58ca409
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to obscure the final destination and evade detection. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://al-farh-iq.com/upload/userfiles/file/87363050490.pdf In PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/gowojezojefuzofasozetilo.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/ff8kmavs62b25usf3ih7varerm/gubinilavefenita.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/gikul.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/lelowupujurunojep.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/dotekusupegokejidaxubit.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/98957372949.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/79268541843.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/58908186746.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/71065662168.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/jedezavuralugatelinis.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/83829680040.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607294426f879---nobenisajep.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/29efcd294674b8d048a34056511e5525/51729234307.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/86440661703.pdfIn PDF document text
    • https://jagominum.com/contents//files/26884397319.pdfIn PDF document text
    • http://hodori247.com/uploads/files/7571207002.pdfIn PDF document text
    • https://quizai.com/uploads/files/jaxodojiwalozo.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/h4qdj343nei9guthfga986p075/97310966423.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/98364001844.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/misigugalok.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/7401406899.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=circuit+math+physics+worksheet+answersPDF 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_off0000b32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32C 11016 bytes
SHA-256: 2b99af6352bd227290b673327217513abb3646de7f740009b8252e9f70b626fc
font_01_sfnt_off0000ccb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB8 15380 bytes
SHA-256: 156274b11ebcefc2806ec8810acccca7f9ed7c467c656a6777e1b13d1f482963
font_02_sfnt_off0000f3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.