Malicious PDF — malware analysis report

Static analysis result for SHA-256 123807dbc48128cd…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 09:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fb9f7c063c6e54a1f80ec361f057b626 SHA-1: d8234d5fcde27d70ca16c99234c697e0e37bbeca SHA-256: 123807dbc48128cd07ee86571ab0f5cdcfb5952ac381072eba20fb8238320c61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable domains. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a malicious intent to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/9466038c72832ba70552e5ba65b183be/64205710178.pdf In PDF document text
    • http://delvalle68.com/clients/54584/File/relibozujifupalato.pdfIn PDF document text
    • http://greenbrier101.com/userimages/zudusofadujanusebob.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160789036e35b3---moriledogomisogiz.pdfIn PDF document text
    • http://cmtsport.com/pliki/40245199065.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/etrdvq20kqq2s6vfhfuf82abag/wawere.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785215b715b---17047205016.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/41582829648.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0272d77317---kulolajilaxilurag.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/fpfg5m2m5ls78qnthu1hil1rqjskuunn/wazapikavigejowovapaz.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/zejudo.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/16951431558.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/gagoruruboxokozoduji.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/90969734887.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/fevifebiz.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/xevoliriwulunopogufusogo.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/13165927335.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98260236cd---19282367568.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2c9f737dd---30822603791.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/8c2f1950c1939abcc1b566b8ee88167c/78782083195.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1626720350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=hardness+testing+machine+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_off0000dcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFE 10892 bytes
SHA-256: 54bd84c37f2a5eec6133d87ac48db8b6f9dc12dc6dd7ae5f33e72b16adb5d445
font_01_sfnt_off0000f5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B0 17236 bytes
SHA-256: 7c7bc1e126b21a1e9cee20f3e3cba4f13664c693c2d320e7c3494d6cd3bad656
font_02_sfnt_off000121f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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