Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de6665e1fd8e47d…

MALICIOUS

PDF

84.7 KB Created: 2021-09-19 02:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7119c0c7f309428b518390e776361562 SHA-1: 55e6cfbf7884dd51f59cb79074515388d8835b43 SHA-256: 1de6665e1fd8e47dec9f91d90044c2de4c4796e8ffd9f87755b5fd70110674d6
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The heuristics indicate the PDF functions as a link farm, directing users to various external URLs, some hosted on compromised WordPress sites. The presence of numerous URLs, including one with a 'how to get a refund' query, suggests a phishing or scamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://krisoc.ru/uplcv?utm_term=how+to+get+a+refund+on+android+app+store PDF link annotation
    • http://meteosputnik.ru/userfiles/file/35331908438.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/buzumufatunegolewubelip.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/72782046515.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/6754129333.pdfIn PDF document text
    • http://precisao.net/files/files/51283338286.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210905230330.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/vinawibezut.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2efac9796---86154013632.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/juzerajilawus.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/6jm5ri8r889she41oulacev5ba/zipilibeboboxixer.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/lci6a70f46f2l780kv6f0vv224/98675356797.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/78363503805.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210913195735200.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/fupipufu.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/58739743942.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/75174187974.pdfIn PDF document text
    • https://mytshirtcreator.com/app/webroot/files/file/82478879494.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/bemopalap.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/begikizubonevivasix.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/75075669415.pdfIn PDF document text
    • http://strandedtattoo.net/file/15641080151.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/91837248.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/n6oda3puo3m0obomg0ak4ne1i6/61482842038.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/8138389125.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/13378930198.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/rejebafuxibaf.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_off0000e683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE683 10804 bytes
SHA-256: f8ed0f725e1b3b60b2282356ccd39e0a7a0b2becbb45efcfb2112008889f3748
font_01_sfnt_off0000ff5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5A 17492 bytes
SHA-256: 6678e2a5979191f5aef82d4edbefab0678dcf47a58b0f0eaa49ce474f117647e
font_02_sfnt_off00012c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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