Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a02ed5056bbf7f…

MALICIOUS

PDF

86.8 KB Created: 2021-09-09 12:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1e6c1c87dfde4551527d806c1fb56f51 SHA-1: 9a9617bc75ce74cfb1bc1c2ec8afbc4a0749b484 SHA-256: 92a02ed5056bbf7f557c2d93f3aebc62e9e98935e0827996ee01da72aa3f26e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to malicious content, likely for phishing or malware distribution, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=how+to+graph+velocity+vs+time+from+position+vs+time PDF link annotation
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d69b4ceb1---23322917787.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/83201699851.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16138e937d7f7d---wuzoxesiwotefogoxuvagi.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/selelazapegitebelatojed.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/49456076065.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305111dc7ee---80784844609.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/gofetisuremopidaba.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/lasawopinatamafopufem.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f88db867fa---somalodofasimanuzoloxar.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/sijopalunujawet.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/73139264993.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161388f1f3ec82---motevepisasipisi.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/disewujerine.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/40269531720.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/11148654528.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/mafidijalo.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/88220423873.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/zuxewubagiri.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/lajomudutinigifaroburij.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/7cdc8c847dddbc10053c7a6441546243/zupetoraruzesozetinod.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///wivomurowe.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/zusuguwukiju.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/2831001759.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/tevekapomarijuregonubisek.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CB 18808 bytes
SHA-256: 093fa845e84ecd7ff33d6984416044ac408675b0ab2575098afeca204062b0c0
font_01_sfnt_off00011ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD7 11184 bytes
SHA-256: 7ec5bf2722313c486b7a0e395abcf979d72c9cb860c2a75a11617130b0ca3e4a
font_02_sfnt_off000134e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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