Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0d9ed704b01c172…

MALICIOUS

PDF

76.0 KB Created: 2021-09-01 00:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e8f8f1fc12588f640bd691c7ef928b6f SHA-1: b5db07fb8666e542e6ecff2de9487d1d06252f4d SHA-256: e0d9ed704b01c1721db057c2be681e47aa9c2628e213467e7aaea601bf99e6da
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 https://cructi.ru/uplcv?utm_term=high+speed+design+interview+questions PDF link annotation
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/a08c9280ac085556d3920486148a4a4f/bavatolojagevax.pdfIn PDF document text
    • http://vo23.ru/upload/file/xiwuton.pdfIn PDF document text
    • https://anfauglir.com/images/file/lubaditi.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/hr83hjoma9krb7gvimm20km1cu/sakaganojul.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/xirolizaviba.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/90f1aba58b3febda6269e2a00b8ea7f3/peratusodiluzame.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/a3dab24baa366c83ef2aef3896719091/66645321858.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/kc473suir5v4j8svqnp4j9a1u6/96699108324.pdfIn PDF document text
    • https://bataretak.com/img/files/file/35180358038.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/isqf2n0027a8b6hf6nkhfnhfc7/19348344140.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/tewiganewugisexigoxemaxi.pdfIn PDF document text
    • http://dsrental.com/userData/board/file/kasisututarofutagogawami.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/0be10066f1d8655fad668c337670727b/11951661781.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/45167743945.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612689c7d566d---xuxurugazapidazorijotir.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/xuralemukijogedem.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/66275623495.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/16829922419.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/20222534555.pdfIn PDF document text
    • https://menu2uplus.com/images/file/figoxe.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/1636122657.pdfIn PDF document text
    • http://mav-auto.ru/images/file/roraselenofinokapogukux.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/40788159765.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/63927439836.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/48538066115.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/kekixexirizinugefilukow.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/fopoxijomuzukajubabonu.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_off0000c549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC549 16640 bytes
SHA-256: 8493fde1a00176598996ef16c9889704338d32e648dad0cc2a7db62c52d684fa
font_01_sfnt_off0000f04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10864 10852 bytes
SHA-256: 7a4c4dba9749f8236a3d2c63a6f4051c56d72b701fadfcc7032ed529c4891e41

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