Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ac7e5f48521e41…

MALICIOUS

PDF

90.9 KB Created: 2021-07-03 14:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 482bc718de265e82163e40344392fceb SHA-1: 79a86deb0651c83e0a5eb42c75bc8bbeb44df7eb SHA-256: c8ac7e5f48521e416c74f3805e9865dee3fac047b15002307e8db079d385c76f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This pattern suggests a phishing or malware distribution campaign where users are lured to click on links that lead to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da25fd46d2a---31713280792.pdf In PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/d688cccc7fac3ff1130efc4cc55e9040/valixikilosujotenoxakuse.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/99296355729.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/23772194653.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/zunik.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/witozurowogufe.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/80768387485.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/80372ace81970b54eef104fd0dc19069/dejozupanonurepafa.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb7f076f9d---wekuzefa.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ff97ddbc1---dedobam.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/phn91f12f8qbfo4k6p83hpc1j5/18068768825.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/62329856378.pdfIn PDF document text
    • https://hagepoorter.be/files/files/wuxaxufufu.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/33386375795.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/bofudiwedel.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093365004620---32224169589.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160acb3ee502b0---87541140847.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/wobulelodid.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/ad87aa808c2c941194aa41cfbcbebb06/26982905672.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b0534f3bf50---vafomukezaboximividekewo.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7dc312a95---83077378070.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8f9844ea9---40425245402.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+five+rules+for+successful+stock+investing+free+downloadPDF 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_off0000fef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11706 17268 bytes
SHA-256: 9bad31c545cdd1fe8d69ba3ec1e524f3bd1b99e7e553502308f293fbce769a98
font_02_sfnt_off00014431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14431 11060 bytes
SHA-256: c7e1e565f3281705c58ae50c878082784fa2f4e10e7f36de083c31dab105091b

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