Malicious PDF — malware analysis report

Static analysis result for SHA-256 16018862ff4fe823…

MALICIOUS

PDF

86.1 KB Created: 2021-09-07 06:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 24fc07bd913391f0f47b7b078f199a19 SHA-1: ab177ef2884cd16ffccb961437e6f93405d0e2b3 SHA-256: 16018862ff4fe823cc44195193d474e1c80145b76d9319326cd00f30d51ef8c6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a link farm and the use of UTM parameters indicate an effort to obscure the final destination and potentially track user interactions. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ketchas.ru/uplcv?utm_term=ricoh+aficio+mpc2051+user+manual PDF link annotation
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/a352c028589121eceb8fe963dd5525e6/jiroxubevogeroluki.pdfIn PDF document text
    • http://texmet.pl/userimages/file/solep.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/buvijetakudiga.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/ht7jjnvcmmjflnjthdfoupb9sd/xefoxodibot.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea9f5d4d56---68810535951.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaa087197c---97483172729.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/29865119316.pdfPDF link annotation
    • http://cdmatik.com/uploads/file/vafarenelawaka.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/19086210685.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/boxuja.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/risepidikalubotunukagota.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee523cdc37---66161121700.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/r6rfp9tqjheud7keusgk4sldb9/8164085824.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/73554196735.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/pd9bnrp898cga47pujan6imeln/tigebalevularenudebekane.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/18636684096.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/bcl5tse8sdc470otf6b93lnbcu/11595729163.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///9571676200.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/d3a338e024dc4f1ad9890101d075d4b3/parilimixus.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd674dadb7---fiwidobawofigus.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210723235315.pdfIn PDF document text
    • http://venkateshservices.com/uploads/rarumat.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/wotedujavugonivekutumati.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/mategu.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/sufus.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_off0000ea1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001022d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022D 18000 bytes
SHA-256: f9b3d72726665f44cbcd91ef8c53d16fc9f2f0ed7f23c02d17fb4cf753cf0df1
font_02_sfnt_off00013096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13096 11220 bytes
SHA-256: f62d69888b82b9a8485fd30f3fb611ef12d5bcec56c22cfec54a6cfa207f5db6

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