Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8d01540461f158…

MALICIOUS

PDF

74.0 KB Created: 2021-09-17 02:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 34859a39eb6d27f49662d2b5e37f25f7 SHA-1: 1b2ee763c74adff325911783e068f6a6ffc84826 SHA-256: 0a8d01540461f1587a5b9738c660868685902c2a1f765162d2c8744b8f87c524
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pixomot.ru/uplcv?utm_term=the+littlest+penguin PDF link annotation
    • https://ljlconst.com/admin/images/file/23375478172.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/78863907174.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/zovaxewaxejelafenunogi.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/84706729178.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/69889751096.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce895b8310---80910710972.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/86445821137.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/82794213515.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ame0ktc0o4lo67jqhab98345l0/25501469727.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/nejuromibabodij.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/sobamaxataketasikuloko.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/70755566710.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/41511624376.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/ramevezexeras.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139c22fa9b0c---51015738706.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/37928071751.pdfIn PDF document text
    • https://geloracinta.com/contents/files/munarupoxusevuwewovopax.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/84023719272.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/3a50eb3ba7716bcd3b7256d710d26cd0/10228127409.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/bawikemanunefuriwitig.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613129a5cccf4---66491423910.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/94263252044.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/9el15bbpb74n3p985h2kn3pk5v/juxipobare.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/waviw.pdfIn PDF document text
    • 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_off0000bb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB89 18392 bytes
SHA-256: 37b84b723e95f5e80698984f752694b2d6d11136f4cda6fcce9c810d8dfe8168
font_01_sfnt_off0000ebbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBB 10212 bytes
SHA-256: 1331f04fdcd989139319dd2b87884dc2bb9b8a554eb9e34733bb20a32f876659
font_02_sfnt_off00010293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10293 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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