Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0bfa3160ed55b11…

MALICIOUS

PDF

85.5 KB Created: 2021-09-02 17:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 087daf1014fce77992af7da9bef69bbe SHA-1: b2e4b94858482381981a6bd9f9a12bf96346f6d6 SHA-256: e0bfa3160ed55b11e83247875de5567894904ac1c8a746afeaf0622101f1cd11
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised or disposable domains, which is a common tactic for phishing or distributing further malware. The presence of multiple external URIs and link farm indicators strongly suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • 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.
  • 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://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/foxavuzijituzuripogakiva.pdf In PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f1395454f---kuterenawu.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/93236880592.pdfIn PDF document text
    • https://luminex.pl/upload/file/31401841060.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160945fed03280---19714401257.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image//files/bitagiwofoludikalopen.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070c07e11966---36291029021.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/72866852382.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/4dejshqn44cipk21olnlnhbpc7/jetugilerawemeduzuge.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/texubudobugiwopozuvom.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/77c7a5c5bd629a0f94948948aa1037cc/busisapufiru.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1e9e24ae6---73091958684.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/12971732195.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/majodajafoziperego.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/ginukipozedu.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/vuovlrnlns8ukfhtvvfjtd4kqk/72616266219.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/34599277527.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5c7fd85d8---51796328569.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/fewiro.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbd770c47f---papigoxixomovopadojesow.pdfIn PDF document text
    • https://koreayokogawa.com/ckfinder/userfiles/files/27842679578.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/fipev.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/9714b178b7affc53b7833db951da33ff/5055943809.pdfIn PDF document text
    • https://brukspec.pl/upload/file/barufif.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe5389245c---99028247591.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/88114552576.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/8ecca420127fcc9edceda6b522d57eec/78846508901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=cetes+banxico+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_off0000e2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB06 20220 bytes
SHA-256: 7c85680bbf7c7253fa7b98ae08715eeee22f524927de9a6dc0699fd658fc3c32
font_02_sfnt_off00012fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD8 10740 bytes
SHA-256: ee44d41372fa990bc5579b71ed736f653c8a70fd11a908ae2de2e8690f33cad3

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