Malicious PDF — malware analysis report

Static analysis result for SHA-256 78660bf238d1835e…

MALICIOUS

PDF

72.8 KB Created: 2021-10-01 03:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ca01d981b3f941f1e309b5d7b64eefc4 SHA-1: e68b3a41900e82f84700e051acc988d6de080839 SHA-256: 78660bf238d1835e2c80d0447d8ef26f28b9d598c968883f500dea310eeb7247
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates an attempt at SEO manipulation or tracking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://topinsolventa.ro/userfiles/file/60328998526.pdf In PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/41e8b21b2e8a25f53c4d1dd5477ef8a5/xegesujerudamiduzo.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/37458217952.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/bezubu.pdfIn PDF document text
    • http://full814.com/upload/files/mikopasebofut.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48005757901.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/rivelibis.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131b0554f368---jitiguboveripuketuw.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/jubibagor.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/e62754b43c204fc3d93780b945343be3/54175956913.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210917012553_536569944.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021092607081788575.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/nakijuje.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/mepaxivadedagagogobufa.pdfIn PDF document text
    • https://bawauang.com/contents/files/33201832635.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/numumivisalazu.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/67061468632.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156475c41d03---70104718326.pdfIn PDF document text
    • https://dolaodong.baohohoanglong.com/userfiles/file/sijurudokuzikujow.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/45558797556.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/kukerozozunowetepajuni.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/65f4fb324a851321fb29e228756c5b97/49498337867.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/8054062878.pdfIn PDF document text
    • https://mikludava.lt/images/files/71586060685.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=free+fire+booyah+app+download+for+pcPDF 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_off0000b72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB72B 17752 bytes
SHA-256: 72cf091b6c549e1a34c4572c3e758800e30aa8c6a5f9bdfb54b39e2e1f943280
font_01_sfnt_off0000e510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE510 10768 bytes
SHA-256: 4c4727a8a0fa20b61e9f3e327ed0fe5e520f434c6269a29e0f3dcdc286a75475
font_02_sfnt_off0000fd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1