Malicious PDF — malware analysis report

Static analysis result for SHA-256 21560090d8a009f0…

MALICIOUS

PDF

70.7 KB Created: 2021-10-01 13:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eb4ce3e481883b0c046e4dc4f632ec41 SHA-1: 7e6435cc511a46eac6deab3c881ad7b25e671bf4 SHA-256: 21560090d8a009f0674abf4345fe7e17ef4cbbba7a3d72f46f427168e55b8ae7
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://lobi.md/userfiles/file/81411290729.pdf In PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/234b1un57d8mhmdtc57l89ao4b/nagerusaridabebusesefud.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/ronot.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/bikobebu.pdfIn PDF document text
    • http://hotstamping.pl/files/file/vilitagi.pdfIn PDF document text
    • https://miet.hu/kepek/48341507703.pdfIn PDF document text
    • http://envigest.cz/upload/file/dobavup.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/30904738151.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/963700c09ace766b3401ef56cb6fd439/levukewoviwabojawikub.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/fitipopix.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/jujijisibugav.pdfIn PDF document text
    • http://zl369.net/userfiles/file/7610786118.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/96793528775.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210919100635.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210908130753.pdfIn PDF document text
    • https://dpdpunjabi.myskoolapp.com/FCKeditor/FCKimgUpload/file/49321325008.pdfIn PDF document text
    • https://yasacompany.com/upload/files/xavune.pdfIn PDF document text
    • http://norilsk.torbay.ru/images/uploads/file/lajomozidopikowupinoge.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/bununaxa.pdfIn PDF document text
    • http://aurora-c.jp/files/files/jejeridowafesowumodob.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16146accf94d64---10544605485.pdfIn PDF document text
    • https://bursac.net/userfiles/file/61099433466.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/bonomapepuwito.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/89208197696.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16151c967ac856---96441159046.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=controlling+android+phone+from+pcPDF 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_off0000b363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB363 16388 bytes
SHA-256: 8a9ff0e092e2f0b1e619c1ca8d17630532f4dd899aa5349f8ffbaa81fc40ca1f
font_01_sfnt_off0000dbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DD 10932 bytes
SHA-256: fedc86d5c047c936ac07e07c2bf5d14113d9a3d2edc58c2af81f09262955986b

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