Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5af562ffca9c7a2…

MALICIOUS

PDF

85.1 KB Created: 2021-09-05 11:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6e71f0539897010130edef8a05f75b67 SHA-1: e78afa5b8361d76af5a49cbe28e504d9951f4dc4 SHA-256: a5af562ffca9c7a23282a02d0aad49c06bf44cf01a32e6d64bf819c267c465c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous external URLs, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to direct users to malicious sites. While no scripts were explicitly extracted, the nature of the PDF and the presence of external links indicate a likely intent to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://montaze.org/democms/userfiles/file/17242720549.pdf In PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/c34dea3836c5be57f0b10c90a641742a/17538172189.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210716230259115.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/3c5bf20d3ac7493a3c882805b068e69d/36459444021.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc111eafbb---pesiboxoke.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e4c776aa488---zugiritotasegemovesipu.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160739e325bbf3---fopaguwasokivinofumo.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc8669b1ad---34319825299.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6dcebc4c12559c5470d53b31288252f0/55148108153.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/zamogobi.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f00dee83d4---wosopivalujajovixewuz.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/moxukozudowoxazosuxop.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/zukukil.pdfIn PDF document text
    • http://geose.ru/userfiles/file/ziledava.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/mezazowavijavos.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/modarapapa.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/89271312523.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/vivuxid.pdfIn PDF document text
    • http://from.ua/upload/articles/2021/06/20/files/20765370352.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/91056287695.pdfIn PDF document text
    • https://adikkedua.com/contents//files/banodogoxepisagadefisejiv.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9b75db667---12010214417.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/bcb0565494af015109013eed28dccc57/vorojakexudafaz.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/78387022826.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/vesepaxilev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=english+grammar+articles+worksheetsPDF 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_off0000e5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EE 18620 bytes
SHA-256: 11602c8f6a5ca69f9d5ce62b26d787ed79e28960aab0cac166d8bb7c15f6c5fd
font_01_sfnt_off0001155b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155B 10840 bytes
SHA-256: 22a66c32682d05cf45ea1d30862a150d779d5156021da268f86ca1231fc09c97
font_02_sfnt_off00012e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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