Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a4a755477f6eb1…

MALICIOUS

PDF

86.2 KB Created: 2021-07-21 09:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3701ff82ed427f41c35ac6eb81b2b5f5 SHA-1: 80c4a0e8e94138ae8a95c82d0dbf7a7e02bfd9b7 SHA-256: 33a4a755477f6eb148c454d0200a86f0d853af486adc61c4ac93688bd598695e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites. While no scripts were explicitly extracted, the nature of PDF exploits often involves embedded JavaScript for redirection or payload delivery, hence the inclusion of T1059.007. The primary attack vector is likely spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/d295cc385fcd2aec22ac47a4c3f677ea/gawebugo.pdf In PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ce0a86c87f0---xifudadinevofizegid.pdfIn PDF document text
    • https://interface-graphique.com/upload/editor/file/70603441630.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/wuwogufujujivofilivis.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/ccd7eed6f3e7c049a3a5cdb8efddecf8/jatagivukoxenek.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/6180594496.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/cp5bqetakt5j8j4hmhk0n2e71f/pawono.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/46064299327.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9c79838dd---75344903116.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f247ca1b157---94643379546.pdfIn PDF document text
    • https://asiajitu.com/contents//files/72953251638.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/7808100850.pdfIn PDF document text
    • http://orderkai.com/uploads/files/wunegureneru.pdfIn PDF document text
    • https://medtek.vn/storage/file/42512463574.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/59133937714.pdfIn PDF document text
    • https://avenue102.com/uploads/file/93246403762.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e213444825d---69458225388.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/tujer.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/wejeriluvedusaminugulos.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/84526211005.pdfIn PDF document text
    • http://medrea.ru/upload/files/72944381845.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/26097825967.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e7e6f1fe12fa3e242feb59cf7caaceb5/wotixamaduvokutavumaviraz.pdfIn PDF document text
    • http://askort.pl/Upload/file/regemu.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/bofajetupomokan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=spotting+two+days+before+periodPDF 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_off0000ef01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10718 11044 bytes
SHA-256: 7cdbcab84524ee461e0570fc752d19f01070f68196672e31911e06cf27137d3e
font_02_sfnt_off00012094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12094 16520 bytes
SHA-256: da93ce1a57a1c5f4ef37a90f8c045ba5bd199f63000c2d10438adbfe1467fbec

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