Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c7acfec5c9d8756…

MALICIOUS

PDF

75.8 KB Created: 2021-09-01 22:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 732cfb8d47981d0bf1c2ca7b2280b1fd SHA-1: 98f6983affdb8f36d7c309ea96414c75c6ee624b SHA-256: 4c7acfec5c9d87565e2be36ec329c3b95edf7c8cd724481ac643b06c69ff8360
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised WordPress upload sites and other disposable hosting domains. The embedded URLs suggest an attempt to lure users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://pistant.ru/uplcv?utm_term=sulfur+and+fluorine+react+in+a+combination+reaction+to+produce+sulfur+hexafluoride PDF link annotation
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864172c5ea0---mosarovavimus.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/32bfc90488205dc0fe2466edb8847810/19023126259.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210707_230216.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/gedirobinolikugebevogefig.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/pogexifu.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ih6tc5k91c5hf03vhfluq9c8h4/7951218819.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bacb441d705---25790457535.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/26799671321.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/74860910593.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161053825bf9b1---pekewirujokab.pdfIn PDF document text
    • http://www.farnostbobrova.cz/ckfinder/files/93346404275.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/62935933908.pdfIn PDF document text
    • http://slanfusa.org/clients/47225/File/38809184486.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/0ba9709aa925591e5e3034ec63ad96b3/86693653426.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/ffcfa15998387889c02e3021e25c35e6/61309908055.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6d85a962---33552267694.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb83a3f50e---vowowotubekonovogudu.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/luligozawiv.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/97507602575.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16088e8df386e4---90712413561.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/simijogewofegujarutep.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/8596769315.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021062405321573499.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/n1925qvfft3iir866o314bolc5/40262203909.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/lbp0623p09sqmh8cl9vgci5aku/88274443141.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/18386461336.pdfIn PDF document text
    • 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_off0000c08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC08F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A6 11300 bytes
SHA-256: 45ea66ba3be5da2de800a2678229b7642938ff72c24afb03612a6f946c208760
font_02_sfnt_off0000f2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BC 17760 bytes
SHA-256: ef5f6955d7e129a410d5723a8f32a1158e0995bf4da9f9152e58508abfb6d4a5

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