Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e85a05bcf7259bf…

MALICIOUS

PDF

74.3 KB Created: 2021-08-29 06:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a95892e7929bada8373d94ec6a52b3e9 SHA-1: e4361a8e6ed03f19c62ab81d72f87821dc9bfe27 SHA-256: 1e85a05bcf7259bf2180ee0f914c048f91b4393f7d9b3e98ccfa2353a2c8b877
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, some of which are associated with compromised CMS uploads. The embedded URLs, despite some being marked benign, contribute to the overall suspicious nature of the document's intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://geriatriccarenewjersey.com/userfiles/files/98229014477.pdf In PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16121900cb6a0e---rukisum.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/83286124470.pdfIn PDF document text
    • https://uangraja.com/contents//files/pefogu.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/moo50r8ak008129f43cj8s5ta2/16211508349.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/kigelosasuz.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/a696ad7df16e24ab27f205ee2fee5cac/30590930479.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f81a5580c7---xamogezalokapaja.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/motefadeseg.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/texupat.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210809024402614.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b487508c1e3---vatekoz.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/8eab490d963fa1ec8ebedd0692c56d90/12435732908.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/gdpb7c1gp76p9g3bod48cgo2nm/66982690391.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/mupijuwafabuva.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/wumuga.pdfIn PDF document text
    • http://splogservice.ru/content/file/sejefa.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160848bc4f007f---54150378628.pdfIn PDF document text
    • http://araonline.hu/uploads/file/15395113261.pdfIn PDF document text
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/60448824349.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/14172778348.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/75550798133.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/rumasofurubobene.pdfIn PDF document text
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/wovozufiwafasinapexarut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=guardians+of+galaxy+tamil+dubbedPDF 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_off0000bd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD23 16928 bytes
SHA-256: 1c2c98712310df72b0f98bc17d4575464fbc98632f5e99aa9c83c9b3f4fa1099
font_01_sfnt_off0000e906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE906 11192 bytes
SHA-256: f352f46bf38df8f0c9b2a8b68eb6ff1b8ea5aa9680baaae7bafc77fb40c3fd58
font_02_sfnt_off0001030d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1