Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc1f2795891ef6ea…

MALICIOUS

PDF

94.5 KB Created: 2021-08-01 12:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 68f38e5e36248e27bade8ffa14cb3318 SHA-1: ceb8f943ad068aa3913789ed1d61efc1a15d4d7d SHA-256: dc1f2795891ef6ea605f286066cfe8b691577a4f5709785bb2cf4a65fcf8a591
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The file contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://pixomot.ru/uplcv?utm_term=congruent+and+similar+figures+worksheet+pdf PDF link annotation
    • http://fitnessklub-impuls.pl/uploads/assets/file/76678601953.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/saworuvalawi.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863c2f1bb02---nisanetivej.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa84e9dabde---bitewakotex.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/agp1e8o223dbnoecd3hj9qev96/36524429927.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/guweduxope.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/xenina.pdfIn PDF document text
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/99053287988.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/xewomenofidi.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/77035688904.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ff9ca5b6176---voxokitebaneliduxak.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/fameguzujizife.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607580c2bf333---37565579058.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160852f4886ef8---71440355763.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/fonumavekeli.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160857355eacdf---46625143145.pdfIn PDF document text
    • https://gamasteel.net/userfiles/file/jojawaropumo.pdfIn PDF document text
    • http://george-dollie-nelson-mass-reunion.com/clients/3/33/33de80a6744892f7217a81a137582dad/File/45178337017.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7a27cf3e8a---75225148461.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/mr5k7a2gm2euunv9o9lfgja0a0/talerolalelukusilurituwe.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/wiwumezami.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/12112450322.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/bigixomevufasopuwemetaku.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2E 20148 bytes
SHA-256: 371638305ce795edaec9acafc5ccdc0016178da77303d85107e27046f4bec634
font_01_sfnt_off0001212d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212D 11252 bytes
SHA-256: ff0125b1092e9dceaa5adb969b82638575bc06e08babc8f8830efa3ea0aefbdd
font_02_sfnt_off00013b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001535d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1535D 16308 bytes
SHA-256: a3ecbc1b423b8d745288b89faad002072b6768fb41f283fd3f75aef93686c365

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