Malicious PDF — malware analysis report

Static analysis result for SHA-256 bec8fe2c9643773b…

MALICIOUS

PDF

85.4 KB Created: 2021-07-18 20:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 495a29f9e414d04fedf4c24f059df3a7 SHA-1: 87c731eec89f50b7bca7f6518c8cfc9963768372 SHA-256: bec8fe2c9643773b2aa95c40f3c1699c61c8f2f9be4b3c3cad5c11cad032d5a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised websites or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm, with many distinct hosts and links to potentially compromised CMS uploads, supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://lordbeaverbrook1973.com/clients/76835/File/podedinepaxabikezog.pdf In PDF document text
    • http://www.anjhimayath.com/upload/file/70573646146.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/76511578421.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/114fd21f1f8aa8d440487c368729531c/tebidifaxazidorabuganado.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/13527533948.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/82vf9a29ekg2fptavmvjnrlfsg/zililakisugobu.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/pojalijabinesiwuworujoput.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/g5ut3g9mpp4kel5hopjr3b7272/gerori.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1203705b0---45242196506.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/bafezewegilepi.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/71969689968.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/47150127875.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070317e3e662---10175198688.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16087ee8406650---gobejirabidowi.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/towarif.pdfIn PDF document text
    • https://arzhosting.com/calisma2/files/uploads/pilenurogizobitesevoko.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/fulotobuponotipuxukunawa.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf916bb993---dawotokoroxaginagajitu.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/1va7u5vgpuu9mfahglj39d18r1/lezuxawamimazaviwu.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/e61911df159c13dc46a6daf62ea74d43/76578294643.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=114+hvac+interview+questionsPDF 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_off0000ecc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC9 10712 bytes
SHA-256: 643b64cdea8d4b7c3c06319fcdc701ce36a088beb97548e47d59873e068e437f
font_01_sfnt_off0001058a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9C 16620 bytes
SHA-256: 5de8d5a278f24de308a5cb861ab01d8fbfa969170edb2b18c68eb230187b282b

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