Malicious PDF — malware analysis report

Static analysis result for SHA-256 90583bc7a7764d8b…

MALICIOUS

PDF

135.9 KB Created: 2021-10-07 07:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 8adc9035fe1c46267628bef470cbaf20 SHA-1: 35dc39e8c803420ad4cdc9f1a793eaa455ccfae5 SHA-256: 90583bc7a7764d8b346cfbd98bd77b595d32072ae22d72654f73e87d32bf2962
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to multiple external websites hosted on compromised or disposable domains. The presence of numerous URLs, many with UTM parameters, suggests an attempt to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://allytemp.ru/uplcv?utm_term=absolution+prayer+in+confession PDF link annotation
    • http://www.tokyomagic.jp/images/library/File/fokusabidogonapisaj.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/zowaxuronunetafozeva.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613495ce4a99e---mujujivurekewiferoguka.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/75908654694.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/muvazemi.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/vadokunimam.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418bb83f90f---laxoxodogulabos.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/fa55dae7807302fee348c3198f6a409a/pilalabudusamisijino.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/rgmcrjpsm3sb70lfrl5bp9hkjv/xepezejalatiluvowimob.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/23895137984.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/82573283329.pdfIn PDF document text
    • http://polipack.ru/content/file/54319966701.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45604350310.pdfIn PDF document text
    • http://stonebreaker.at/89851009959.pdfIn PDF document text
    • https://banghenails.com/upload/file/98674622316.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/95643147511.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-10-7/20211007105807997696.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/xemodizegirawerofopa.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1614edac062225---nifofezexowiropedelul.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/16905038408.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/mokizipor.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/kakupufefa.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/gotusutoxetiketigu.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/zemunosifo.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202110041557206724.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_off0001a6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6AB 22364 bytes
SHA-256: f2813310752b1ed8d6fa6d204f117294762bcb41248b2de43f03bf3c3753bfc5
font_01_sfnt_off0001e056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E056 10808 bytes
SHA-256: bb685b720fde1a232ebe92e780251884ad645ddb4a1fcff4328cf65a5eaa799d
font_02_sfnt_off0001f93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F93B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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