Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f1418c26838e3a4…

MALICIOUS

PDF

89.4 KB Created: 2021-07-24 01:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d74e315faf6e47895ecb51ba73f17767 SHA-1: 4d4cce3a142f5ed0349eac6e1cd8dfb058915324 SHA-256: 8f1418c26838e3a43e6c95306e3a8dbdf0ac93be7442237056d230a5ec06475c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of multiple link farms on potentially compromised or disposable hosting, combined with urgency lures in the document body, suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://thebrownsfamilyreunion2008.com/clients/81208/File/44758084482.pdf In PDF document text
    • https://avgdesign.com/userfiles/file/volegomebunupuzalewo.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/beruveviwusubanovevomapa.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16093f4d4b76b9---linuga.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/zalamedexotepudoladef.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/98914686561.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1bee5a658---3713450335.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/30027505845.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/830e407d81fab1028c5a54e527a92822/gozubajarawolilumixojon.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761a1d5aadb---9979065638.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/erqthug1oci3rha25c33bgbk9l/jesanosutonipo.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/fab19df2c55d1633e2f1b48c4095d52c/fupivedino.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee13bc6e662---47204952316.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b66853c1f56---88959427943.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ek1aaltdadsht5tu9os97fvqa3/74427542001.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edf63fef522---lonato.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/fcf46245d5c58ddbd48ed3ceec28502d/buzareluzigetoxuvefule.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/71827399761.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021061816550973499.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/91848927497.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///35319382215.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/basifexupodago.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/pubugujavejelopewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=miop%C3%ADa+astigmatismo+e+hipermetrop%C3%ADa+pdfPDF 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_off0000f62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62C 10848 bytes
SHA-256: c666cd98b81de34859e9b310b77005a17af231ef957599065e80b0e1798bf1ef
font_01_sfnt_off00010f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F09 17652 bytes
SHA-256: 12894407f17565f6ec85da33d08a7709c79fde7ce9f031e77e08097a03a5a407
font_02_sfnt_off00013ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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