Malicious PDF — malware analysis report

Static analysis result for SHA-256 171e82aa7b694946…

MALICIOUS

PDF

89.0 KB Created: 2021-07-01 11:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 29db57c25e3e669c2d1ede346d820840 SHA-1: 0f7cb3dfdd5cc58cdbb2cb218c2257c401cd5ad3 SHA-256: 171e82aa7b6949460df0a00f6ca64e85188dc86090194c46e9f779410c7a58da
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. Heuristics indicate it functions as a link farm, pointing to compromised WordPress upload storage and other disposable hosting domains. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e25c132cf---guzekanoseforosini.pdf In PDF document text
    • https://galerieportelouise.be/userfiles/files/vitukemezega.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b696688d2---bufurofokawumowa.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/0f38b7c1b25d4853fb9adec97daad3f9/76480045082.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/b6bfacbaf3beddd1ba3b5c04040b12ee/sutolijenukasuwu.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/fejimovi.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3ab4935c3---50382816991.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/26950578117.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/edfbb786aeddb7dac455a67ae7d58256/33795730126.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/10609279069.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3eee7a0eb---89399184847.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76546121713.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aef7f12a64---kinekilef.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ade20196d9a---zuwijogota.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6067018220---bixek.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d49c45964---nukumobebi.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607730f721ae2---dojop.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160847af70fd87---58058093186.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/19304071896.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/pokiwerabufe.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/devewedoxokikowigifikik.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2224b2d9b---kevuzugitavisajosor.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/48cde49a90189bb10ffb8759d115fd10/50311874052.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/27077612983.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/4c90090df5ab5a21b9d8fc6a775f7ef9/besenugesejemax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=4900+marconi+avePDF 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_off0000f949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF949 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001115b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115B 17404 bytes
SHA-256: c4862d56f2f374a8595283bd21824125b014b4750669ff5104d3099d5a6bd219
font_02_sfnt_off00013f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3C 10416 bytes
SHA-256: 1a53660c55b6e0de4b5a89d93005e1378273e825db8be5f99df63f3264069fa9