Malicious PDF — malware analysis report

Static analysis result for SHA-256 1047eec48c2ed1ba…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 16:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e2ec706bf0f91c6e45c89218250798bc SHA-1: 7cb83c888b194b02f809b961f91ec9f065fec89a SHA-256: 1047eec48c2ed1ba07869f591545f109b1c57784c3d0f7f8f10bdd9dc668939e
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by both ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of multiple unknown URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://hv2barrier.com/application/third_party/ckfinder/userfiles/files/18559259449.pdf In PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/desifiv.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/49329673226.pdfIn PDF document text
    • https://beautydent.hu/editor_up/gaziwivom.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/wuwukatosezomakexifejuros.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/wovuvurofesoronazap.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/fegukiroluguwokigudu.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/lopen.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/42273898012.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/25401839153.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/32896756750.pdfIn PDF document text
    • http://glassick.com/userfiles/file/64572045135.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/22036331921.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132198625e71---61598204529.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/2cjra7hcennfri4dfc2koppfgt/nikopab.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161357880f0445---wawanuxokalenuwaxeg.pdfIn PDF document text
    • http://juentai.com/userfiles/files/23244556084.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/repevafawifizuvobutamen.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/12179931471.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/lelevekukegefavevota.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/jenusajoz.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bc28a7233---95664255581.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/d60c6a680e6f3eb707bf88af4fef53c1/magazomuvewafarate.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/84356930333.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/jurevepamalejamerajojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=league+of+stickman+2020PDF 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_off0000cc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC87 10924 bytes
SHA-256: 672b1ba120c7b39ea0f7c804e659b8e0e0820ac54562b179d5122cc75ac03f7a
font_01_sfnt_off0000e5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE00 21028 bytes
SHA-256: 2f6b72fcbb513c9594181e75df2447c5ec28f2171cce800e8c9d4b1d204189a7