Malicious PDF — malware analysis report

Static analysis result for SHA-256 49111b59e3573e5a…

MALICIOUS

PDF

79.1 KB Created: 2021-09-04 06:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d96456ec8308c75f58281822f1b76773 SHA-1: 7531b533e70e40fdc37535c13f3e836eca127f6c SHA-256: 49111b59e3573e5a2914dc989fb799d1597f2440a0ade9c7db9ec907b4a5be5e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The presence of multiple unknown URLs further supports this phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764ff07268a---jipuvodaxitokomegavovewu.pdf In PDF document text
    • http://1-cx.com/ckfinder/userfiles/files/badovubimifilomoroma.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/pefozenavin.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/ec729a6eecc1855f594964cb3c463805/vajofironigifeke.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1611af264133cf---39805192896.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/54106764170.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7e499725a---48154115211.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/bezujipewebapunujatolodu.pdfIn PDF document text
    • http://asqcert.net/files/files/96597786695.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/7ad66f9e9acb49c441c9415f3ca3046f/kedupewiwasivusi.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9442a0ca3---sekiwigaxugez.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/dopeguvodazinujilik.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/dovonorujuxanibufodegobu.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/44732272925.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210820132026_ogjiuf.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/luwagusagulud.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210603005012_1739698029.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/b1ff3e11f9f73ab8fa1d6c0e2de056c1/gixasulogibebujudemil.pdfIn PDF document text
    • http://dakmet.pl/upload/50772730534.pdfIn PDF document text
    • http://www.heksan.com.pl/file/difebakoseg.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/777ee6deabea1d303f035d9754f4d0da/30938798070.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/mibobun.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608098c37f809---37548931557.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/67579450435.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/63c5d0b05a76e6ddc52ca68335a99528/dotenaxorifeferojesaja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=draw+io+export+pdf+errorPDF 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_off0000d24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24A 17420 bytes
SHA-256: 44c14e8c817043e58a1fc3d515cc4334111f28124e06bc8c743baf97408c6a24
font_01_sfnt_off0000fedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDF 10364 bytes
SHA-256: f711062b70323e76ffa923b555a6852acef97cebc432324a16dfaaae19387234
font_02_sfnt_off00011675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11675 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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