Malicious PDF — malware analysis report

Static analysis result for SHA-256 882d42baff1f0da9…

MALICIOUS

PDF

85.0 KB Created: 2021-09-17 23:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2b2494f52b5630708ba76e5db6b04155 SHA-1: a771f80929e825167b57d63ea60121ed80c68ab1 SHA-256: 882d42baff1f0da96bbd94f08c9fc893c5b74df372049032d7133ae901a2eaf8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF functions as a link farm, directing users to a variety of external websites hosted on potentially compromised or disposable domains. The presence of multiple external URIs and the 'link farm' heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://allytemp.ru/uplcv?utm_term=photos+to+pdf+apk PDF link annotation
    • http://residenzaeden-albisola.com/userfiles/files/76776192311.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/gawipokibanobe.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/26200086918.pdfIn PDF document text
    • http://esipro.be/userfiles/file/pirejofeveresudur.pdfIn PDF document text
    • https://digireg.gr/upload/foniremobukafa.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/zevatirateteloniniwe.pdfIn PDF document text
    • http://entrackintl.com/uploads/66624685432.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/24414687351.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/d45209f8d6583ed169c80db338eabb0a/wuwoxina.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/sebasi.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/65985435796.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/33086341817.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/22976129423.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/36119172202.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/vofifagisovemisafe.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/77953768990.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac9ea1d3b2---71171222214.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/47337508922.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/55833826173.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/birajujusifitekupemumuw.pdfIn PDF document text
    • http://usatovl.ru/upload/fckeditorfile/48940892086.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/vixajesepelodameve.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/60164560947.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385ca82e42b---33218603241.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_off0000e919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE919 17968 bytes
SHA-256: cc1db5a20af81705c808a64404e7310ac8198abbf74a76aacb7ee618e198f812
font_01_sfnt_off000117a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBC 10216 bytes
SHA-256: 835253c101d5e40ddb2da72a7a2e6ba414b113854ceb9d7f96b93aa939bbce92

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