Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca413e0f7c75096…

MALICIOUS

PDF

89.7 KB Created: 2021-08-05 05:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 68e83d5901aae43a27805ea7af119635 SHA-1: ee86eb61bf17764f27aa7f040dcd5f3cb78ac410 SHA-256: 6ca413e0f7c75096374d60e0ddca834b1ffb0e90562ffdba03b296f4470ff155
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised or disposable domains, suggesting a phishing or malware distribution scheme. The PDF structure itself is minimal, primarily serving to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/b02dprd0hj85nuj58l1b9kjqc1/gakavexivudobevadutinuse.pdf In PDF document text
    • http://bpsstudio.hu/uploads/rilafesukupogode.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210528121459.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/d00aebc111c0ac9a19b17d53b8508f7b/29790414763.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/66095452870.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160fd95dc72437---58647480752.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ed5e5e098---78771497354.pdfIn PDF document text
    • http://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/39769404911.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/94570061324.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/aeb9c8f053e911b2e7fe7cbe43611cdf/bisix.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/kenijivanazowosavi.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/4669b4d4765125209892f0718ab73457/xesirugabet.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceec5ea4d6---68646180820.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/getemexamofefaki.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/kalinusosimesigimugufu.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717ff59ec09---pobipesejetopemi.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/7936709881.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e847863653---javuwi.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba473d1e0ce---nexorudowolarozijej.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/danetanowexadepafomo.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/056a96e4256725cbe3abb794b42c726f/rakivowasobufunafopopavu.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/b9c730dab18b12fc14aa4db523779580/62406084280.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093c44aa4229---zodibilumegolamawuvuz.pdfIn PDF document text
    • http://saintthomasmonrovia.org/clients/a/a7/a774d5b45fc75aba9c6fcf07501e1e58/File/detalojogokozopuwokab.pdfIn PDF document text
    • http://mobilenmr.com/files/files/98832436393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+reset+indy+evo+headphonesPDF 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_off0000f8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EA 17792 bytes
SHA-256: 3dd3505b157811627ce2c0c88004cc58f6e97cb5357f77e44fdcec47ff48444b
font_01_sfnt_off000127ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AB 10700 bytes
SHA-256: 5f08bb183f65fd40c8598e4dcd8b5a7bc47e8477e10ca69a74cb455968118ea0
font_02_sfnt_off00014037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14037 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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