Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d90c60afc3b77c3…

MALICIOUS

PDF

88.6 KB Created: 2021-09-19 06:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 806d2d70ba7055391f606e2352912356 SHA-1: f7392d3ed38de59cdda5b1da1dbd8c71fe8695ee SHA-256: 2d90c60afc3b77c359abd0347077a69b206c1957298547ccb2c089f500ce87b4
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious content. The presence of numerous links, many with 'utm_term' parameters, indicates a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/66848527331.pdf In PDF document text
    • http://asremajazi.com/uploads/files/69556220071.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/30180454862.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f997458e88---siduxiveximuwekujoguv.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/58223638895.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/jowaj.pdfIn PDF document text
    • https://led7.ru/file/samavul.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161468a3bf107a---23857814990.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/wuxezenezitovafata.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/wanesolaganimotovom.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/veget.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/85625608784.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/jevufuzexefubimubojewu.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/nijusujilinodavagat.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bad2a6a32b---94001406469.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/69634462742.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/16924235027.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/mirokexepikevanomemaf.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/79951492179.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/cd17e126eedba35f76132d3d5bbd8d39/67966996398.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/lijiwagedofikiwuge.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/ae33a14d102be8aa09c45a1746c5ede8/lulukirufipivukavawipe.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/74655730938.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/defami.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/30138728617.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=libero+chat+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2E 10352 bytes
SHA-256: d877184ec2ad2fcaeaedf87d1d10b3de51a820030a0a3e2b38400ebdd34fe0e6
font_01_sfnt_off0000f176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF176 18844 bytes
SHA-256: a042ca502588948f90af28d0ff9033accf602db662e382bd133713a51a6191f0
font_02_sfnt_off000121eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EB 17696 bytes
SHA-256: 6e2db123bfbf09c3526a8a789016dee7e1f1d5662ec2ab70f2b0fe4ef817fccb
font_03_sfnt_off00013c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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