Malicious PDF — malware analysis report

Static analysis result for SHA-256 76832ae30b09da94…

MALICIOUS

PDF

82.7 KB Created: 2021-09-02 01:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bcffcf06dd07214c04bbe1c2a39a17b0 SHA-1: dd58f47ccc96c92153cd929336bece691d7c96dd SHA-256: 76832ae30b09da940ed69eddf27b1e29d6a2ff2efe358b6ff57eac689d9c0bcc
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links and the overall detection profile strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://bluza-shop.ru/content/File/tumorazemeteletip.pdf In PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814a07407a1---34765258764.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/xozix.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/pufivegokesoke.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/towusakunifupev.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/fopopizuforazamikonaleb.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/pizopogujofugafevatemokil.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/4a0ebf2e4f4c935085cc6befa7214cdb/97305821934.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/xonovisunuzomuputiti.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210618160507_381590413.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/vuseg.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/8188699755.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/dikut.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/kirojamixogavu.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/d4c5768b91915e4fd113a850d17f83bb/nebefapete.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/2bbb2da0bc0588f09d1381307175a15c/65421891921.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/28374257609.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/mr20n5jai2imkmvn515v5on2hc/973866840.pdfIn PDF document text
    • https://majubesar.info/contents//files/98501428556.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/7385064778.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611475772c053---84743827851.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/48984705816.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/66806588855.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=five+night+at+freddy+help+wanted+apkPDF link annotation
    • 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_off0000dcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC6 17656 bytes
SHA-256: 43a0433947b7a9d137c11b2c6b8d4eaabe61ea9734af8db8355bb38760b0a06d
font_01_sfnt_off00010a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12299 10824 bytes
SHA-256: 8b01ba10f1d57ae87159333b7ea18bbc3e637ed6bb8d6ca8bcf1930fd62208f7

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