Malicious PDF — malware analysis report

Static analysis result for SHA-256 3109576a20700b57…

MALICIOUS

PDF

83.5 KB Created: 2021-09-04 09:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 44afe4c4cb35b7144d35038a1e2f525f SHA-1: b2c863faaa380aa4a53ea560b9c62d5735906a1b SHA-256: 3109576a20700b57d6e8646f7b30f15380bd616522ee4181e661e1523fbc38e9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to potentially compromised CMS upload directories or disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The presence of these links and the PDF structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://samurairamenbar.com/uploads/files/mumasomizemowojawem.pdf In PDF document text
    • http://nowator-zpu.pl/userfiles/file/77240230154.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/55471424437.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace34d62ac9---rifofotirisefapomigew.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/69aef907355a3fe1b8e7d114ca211922/voduwetazuluzokasujopogem.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/99548853543.pdfIn PDF document text
    • https://yuss.it/file/31676242165.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/58529478727.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/gopokobalunemutaxizisut.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/vebefilo.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/54c7a03746503b9cf9ee325493bf6732/34869011218.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/geboresefizamapugonokozo.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f31533d96f9---faxalepuwanuko.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/gumefalifaviseruvazes.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c05354d778---60309996195.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dca53d5addd---mimufoj.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161136082eb74a---16797156924.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/54865770047.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/dusokimojokovo.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f4f9456fc8---33478120105.pdfIn PDF document text
    • https://ancoraeducacion.com/images/senavinur.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/ruvixuzukijitumokogosuwop.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d1a35bdbb---74786094547.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/86232650186.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/44425083435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=divine+mercy+novena+pdfPDF 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_off0000e290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE290 10652 bytes
SHA-256: 3f9f04513023f9bd7c77af079538ae92a8f4c848d8a57e9c63162055803bdd7b
font_01_sfnt_off0000faec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FE 17756 bytes
SHA-256: 1afe52124af338bdcd57f3b8b209d7fb714509debb7720ccb7506e18a422b7e2

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