Malicious PDF — malware analysis report

Static analysis result for SHA-256 42570e2ae7c93d93…

MALICIOUS

PDF

77.1 KB Created: 2021-09-03 15:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3c4e1f3fb84c25b60b556ce6ca50d111 SHA-1: b33905f955836b0c2cbc0f74f78bc5ba9ec2c2df SHA-256: 42570e2ae7c93d930ebd7c03ceedba373ab2b3550eded4adceb02de734390504
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and WordPress uploads, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of a visual download button lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=westermann+tables+book+pdf+free+download PDF link annotation
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/amdqti18u6fbi5fm5b2qo6eoat/91677516308.pdfIn PDF document text
    • https://cooperspick.com/files/18722644932.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3f7750ab2---98587610772.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/mokavifeb.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/53143153492.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/kijik.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/mkt5mbpged5jkfq5im3gpob9u7/jetamuwebugimuxivefetal.pdfIn PDF document text
    • https://spacio.hk/attachment/file/filofomake.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/gikizilidivelapakabub.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f581421df---nulunisebup.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/80028946548.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/zusuwonuzi.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/fd4c161680ceb9e6fa9d2038039da125/pesudenitekexeso.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/14152533972.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073cf949e57a---4666921953.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/pamagajumutu.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/b0p068s6es3aa5hfb0qvbjop05/rabevesubokobusebin.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/90473780917.pdfIn PDF document text
    • http://haai.org/upload/file/mujagowigulaloroxez.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e31e61164---92474504073.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/rilegokizitakivaz.pdfIn PDF document text
    • http://schokobrunnen.com/idata/61657282769.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/56165496147.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69284723751.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d31f44c7a5b---30873306474.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_off0000c846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC846 10880 bytes
SHA-256: cc05974748fdec86ef50e7d6004cde4eec57ba766bc950c97359b96ca37da0ab
font_01_sfnt_off0000e14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14A 17308 bytes
SHA-256: fbe0a1e7d38ad237338ffb80c75d5dcee10279edf82e2239c38f40bb52aad6ec
font_02_sfnt_off00010e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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