Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2e17209a946c7fe…

MALICIOUS

PDF

88.8 KB Created: 2021-08-04 22:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 42a6680a663e444467a0c4512343628e SHA-1: 8ef8318a0832d5940952ec023acdd64b5b629b7b SHA-256: b2e17209a946c7fec7d5b80259b5628d0d630757af53c736b925274c46c3d80c
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress sites hosting PDF files. These PDFs likely serve as lures or redirect to malicious content, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc365eab3e---pijanogizumagokunitin.pdf In PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/p53vquul3alcg7afjuljempi26/3574546816.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/wowuxirebopaf.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/830ecsggvbttg2ag3jd5409k74/nitelegepuzu.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160d662a7d0dc7---70063746106.pdfIn PDF document text
    • https://airshow-bg.com/file/zuravi.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce3444108a---nakutimimibevoxuvekuram.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/vazuwoxisepativex.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/tawopusezepogowogej.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-07-14/images/files/febedetisijevaralasam.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf848d00ce---37972715564.pdfIn PDF document text
    • http://candientushinko.com/images/file/jepovudejazuzigavi.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/kekonowosotiniwu.pdfIn PDF document text
    • http://belean.pl/userfiles/file/nadiwesudid.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/5u5o4eqdp0jnslo4pprdpid7iq/97657140639.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608079f383ce0---5013480825.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fcbdb5b9acf---doxunavuwovezuraf.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb4b0ac2e5---lizilunowepujarotiposoxo.pdfIn PDF document text
    • http://gojjang.com/uploads/files/38188041755.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bb5e9d99b4d---27145141562.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/e08a380b112570d911751b4701e336c6/82447906583.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/5003771078.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6cd149885---zefarizupijum.pdfIn PDF document text
    • http://biosite.ru/images/news/file/videbumewipavixutegigavom.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/3mb9f5ganb83qvsm0p7m7egseh/xilelujusetozovitonaxar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=gta+san+andreas+gemi+hilesi+ps2PDF 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_off0000f318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF318 10876 bytes
SHA-256: 613b84d629f7d2fc505131609e53a18a8c79f15d48427943e93ec8a495d1a1e8
font_01_sfnt_off00010bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD3 19292 bytes
SHA-256: 2b47b011e111b63256360547d752e8f54df7f2221ea42d46c029bdd63d9ad763
font_02_sfnt_off00013ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1