Malicious PDF — malware analysis report

Static analysis result for SHA-256 bec9cc5d58a93ff9…

MALICIOUS

PDF

72.6 KB Created: 2021-09-27 07:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bf1291ef428d1a234dd23d31c0809737 SHA-1: 4cf35055f4cc6e4a2657c03da33305f3f7c309a5 SHA-256: bec9cc5d58a93ff94671252725f1e432ff2ff8282d6ca48adc3571d17a88c76c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the file functions as a link farm, directing users to various websites, some of which are hosted on compromised CMS uploads. The presence of numerous URLs, including those on disposable hosting, suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://aroma-es.red/yamituki-n/uploads/files/94819479935.pdf In PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/11365167005.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ada934494bef96ad3aa167364fb7b53a/fenepuzurifeluko.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/gakodonube.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/waradudesaf.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614e21155b69d---18789142401.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109062123211362.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613576c8af3d6---fixozivu.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/93fbfb2714495dee7b0c0ed54bdad0e0/pavexexewinubiwuzege.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/zafeka.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/bivosafa.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/67567893859.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/jujemaku.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/81643403430.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/kemobiwumunepewa.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/kuxududavamunogopiluk.pdfIn PDF document text
    • http://henca.com/files/details/file/10189297912.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/10343787467.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/xugopabavedijibegenole.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/40872018577.pdfIn PDF document text
    • http://elma1.ru/!upload/files/33057354183.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16140bef8e055c---sizekoj.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149300b8146d---39263158989.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161382709584a1---xusajepowomeragub.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417db6eefb2---67394969234.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/zixumotijoludikidexik.pdfIn PDF document text
    • http://princeverma.in/uploads/files/masuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=day+of+the+dragon+king+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_off0000b7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD2 10768 bytes
SHA-256: e00d4fb1f601dec9ef11dc2a07acbde1850dc69e6fce1cdaa3c0a248cea67da9
font_02_sfnt_off0000e855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE855 17292 bytes
SHA-256: 7dcde954cff9695c9f12b0f63b80fbce66ffd435a505e3b0da986db64ddc661d

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