Malicious PDF — malware analysis report

Static analysis result for SHA-256 f88ae0d87c075a0c…

MALICIOUS

PDF

82.0 KB Created: 2021-09-06 05:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 789b3c37f859ab97bc31f0035ea57f28 SHA-1: 18b08f0b6357f1dbee3bcb658a00f6ef89274193 SHA-256: f88ae0d87c075a0c7ebde47668c249b6fe7bfb7a079617aac6c677f139bb77c9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and link farms hosted on disposable domains, suggesting a phishing or malware distribution campaign. The file's structure and embedded URLs are consistent with a spearphishing attachment used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://smidgel.ru/uplcv?utm_term=suma+y+resta+de+decimales+ejercicios+para+imprimir+pdf PDF link annotation
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/93ea064bea677eac8fe38264ce262238/85021367912.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210730190105.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/c96b3855151ef015b8affe101999b6b7/korufo.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fc51cf39f---38423097453.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff42ece8e77---54402658318.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/10707924126.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/60042237937.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/de819837b1980a1b8f56f12da5858a43/50103801523.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/7273fe56b8102a6659cff8bc3c3f47db/maxigepugimizejadufis.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160928ae252f94---vanawedavibo.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/40212455435.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/gewuwudomaxoxudaku.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090f8388761d---48133802506.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/303849e002b8da26354dc556a3f48104/81801329986.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080124cec9fc---55949394405.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/nopezisaposurilepat.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/68569007996.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/88810927977.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/wutupapomuruxajazogefu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/7g42ks18oo3aci9ufttcpg43q6/25256603706.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///maxepimuvuwujinonotiduvo.pdfIn PDF document text
    • http://vo23.ru/upload/file/zekara.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210605/0337384053.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_off0000d680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD680 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE92 20312 bytes
SHA-256: ee81852759def3969186e630a629ea0acf969f1e104d900aaba9740efadb0774
font_02_sfnt_off00012088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12088 11096 bytes
SHA-256: ed7f31fe0b35ef6fea467a77f80d0808cf7eb463839d304cdfab3d6b8d2faa11

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