Malicious PDF — malware analysis report

Static analysis result for SHA-256 87be483746937d18…

MALICIOUS

PDF

90.7 KB Created: 2021-06-28 00:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ffe14ce40bb9e99ef77f6fe38048843c SHA-1: 470293bbf1352bdc564bf43e08adceda19fb3104 SHA-256: 87be483746937d182776dfd109e303c6cbf0d9f0538a8811bf8c0c6cfdb5b382
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs are present, some hosted on compromised CMS uploads, suggesting a distribution mechanism for potentially malicious content. The PDF structure and embedded links point towards a phishing or redirection attack.

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 http://smithmaloney.com/clients/3/32/32eae1a42220421eddab78da2f55685d/File/66286260338.pdf In PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfbc4dedfe---batozukeseso.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/mpprv6r7i7sfsj8dgdaf7rapd5/61617750137.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160945672c171d---86930089505.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/powalimadipoxodolo.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/28759977077.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607374dae770d---budebijukopetudukekilekaj.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad99f0aca4---mapojunapo.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c7128bc2c---89237336306.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/6b65e95b80fdfbc8b3aa97eb4ecddd85/12819986976.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a53cc5b12c---vuwutu.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/t614bfp8bcs10vvmapjcd2bat5/bumafexovofozaj.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/94805994865.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/tagorepixediwilogipapu.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/57202304532.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/c0751b764fb8adb5bcf901c008f3d332/42313806494.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/dd4diekphvnuuscvpblutqemp1/81597610281.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/2ad6d7501b7d0d6d0ecbe995365fe4df/peziwe.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/89414179155.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/c74c20e5644579adb512a88d59eae0c3/bawijozuwejaxadabe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a2c5dc577---zopuvovemi.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/f0c10bed8ec8b3270ab7585b63c2b96f/pipoji.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/dozogokigisovikudupowalas.pdfIn PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/zisutubakikanusiwum.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16084f9451b4fa---63538705360.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=male+and+female+vocal+rangesPDF 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_off0000fc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC52 10688 bytes
SHA-256: 3d1c447b8c7c4200d7e09e82b0af7c88292b4cf87649d52ea6bfaf0b52a798f3
font_01_sfnt_off0001149d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAF 19268 bytes
SHA-256: dc6ea1e97e04e3957008414ac62e8486afca509d00ef94437ca705594e82cead