Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7bea76f8a578e60…

MALICIOUS

PDF

89.1 KB Created: 2021-08-21 12:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ea668aa90660e73cd9ecade535ef8f88 SHA-1: d2afb45544989fb064c239b416f6fb9902dc6998 SHA-256: a7bea76f8a578e609d35afe4853a85ca37edd187c15d2ae724f11e5a4f880618
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting and a fake invoice lure. The embedded URLs point to compromised WordPress upload directories and other suspicious domains, suggesting the PDF is designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://farmina.ru/uploads/files/7543609292.pdf In PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca5d9803c8---tolufikugibababewiko.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab80523358e---zotirajakibapemogivufud.pdfIn PDF document text
    • https://bataretak.com/img/files/file/wefagomirut.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/xamujugenagugozeduxuti.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/81f4c1af32306536b220f2589baf7f64/sipaseviramisojujud.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/20386742094.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/96954048967.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/diwefinofazivelagomisoj.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/kimanegupiboz.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/33285445659.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fd24d871b---girewuxisaruk.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/xedinesagizufurepaker.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607789382f1d7---81837638706.pdfIn PDF document text
    • http://promobryansk.ru/userfiles/files/62633122391.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/1cd620966382527eb49b4cd2c7b0a7fb/ravoda.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20217292135121569.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/26203345506.pdfIn PDF document text
    • https://viettrungson.com/media//Files/gizutetosudomojexikaganez.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/mutoxadudugamofur.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///fozopekijorinuwukiware.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/wuzaxelu.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755dbc3be5a---jarejilazifojaxogavibob.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/b2b13f6e6cfb5e6c0c82d08b7bb4b64c/9749055315.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/63463306290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=bajaj+allianz+general+insurance+online+receipt+downloadPDF 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_off0000e23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23A 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_01_sfnt_off0000f7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BA 11120 bytes
SHA-256: 1b5e1f8ddadcdb949be72a110880d4b86c8b4335bae780f016a1cc6fd46769b9
font_02_sfnt_off000111aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000129bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BC 15932 bytes
SHA-256: 9187d0fbcdbc54d953946ff6023722d0601c13201f9b2676ca9ad22f45bd3642

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