Malicious PDF — malware analysis report

Static analysis result for SHA-256 54126184aaaf9e45…

MALICIOUS

PDF

113.3 KB Created: 2021-06-29 12:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b3117a0ea966cec45cee3018bf46e593 SHA-1: 890a5bb85137566d7f244e17724fc3623abcb3bb SHA-256: 54126184aaaf9e45e0eb4e7f3c037a4bd4f5dc8da0872f4bc32cef774a4135ee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. The presence of numerous links pointing to various domains, many of which appear to be compromised or disposable hosting, strongly suggests a link farm designed to obscure the ultimate destination and evade detection. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://grupahatak.pl/admin/_fck_files/file/69607093812.pdf In PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d35915f78e---54323321982.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210528003842.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160730529373bc---62548951414.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/56141214575.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/91d758227dd6eed2fcce9f8dcefbb4e1/dotevomawo.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f53345a67a---kirino.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/sahca859oddfngc4f5ll5qig2i/dukevenezoluwiguwuf.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/43616372733.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/25267017322.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0545415e6b---23781744346.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/7c0cc0ff56dcb9a3e8040b45adf833d8/65823766829.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/xubuvojesodu.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/wosilutokobovopojixaritek.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9baa227de---20010095025.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/5a75cdb8981c0c62b8977e8489b93039/tewugasefa.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/ooiebhmv6c4i6r0ol4ibm82jvi/wilid.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9a4ec7079---zejeradunelixalufinajelu.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a39c2654e9f---rixawa.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/vairg3j1rcr9re7ugd83ncnfek/72116517794.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/mebefedajeg.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/71070713071.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc34c7070c---neturifezow.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/24300405044.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=coc+best+troops+for+attacking+th12PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F64 11148 bytes
SHA-256: 6c49517362242dfc76c7f363ac9990377d1b4446df59a16b9dbbd0835e60ca64
font_01_sfnt_off00015949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15949 16208 bytes
SHA-256: 4602efdc27effd6d0b9796dd62a14020f6514d216ceac1da6ee579af8a0da4e5
font_02_sfnt_off00016f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00018720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18720 18284 bytes
SHA-256: ca61b71568a4c9c0157c13da659a2d22286a74eb17860f06bb51ecbe443d4a04

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