Malicious PDF — malware analysis report

Static analysis result for SHA-256 84838497b96113bf…

MALICIOUS

PDF

73.1 KB Created: 2021-09-03 07:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1324bfdb835e9fc9169bfa3b14c6401d SHA-1: 5cf6f2310785733e5e6ef217cab830cbc3277791 SHA-256: 84838497b96113bf520b0ed65d8a2e543567445f25b7bba3b3c1ed972ed094a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to redirect users to malicious content or phishing pages. The presence of multiple external URIs and compromised CMS upload links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://crewmak.ru/uplcv?utm_term=all+types+of+casting+process+pdf PDF link annotation
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16128becb5cecd---48078449379.pdfIn PDF document text
    • http://brukbet.com/user_images/file/97102163636.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bf6429333---66446865921.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/51d7d06067a70686c2e4462e64604e9d/raloxazibalexefejesuzos.pdfIn PDF document text
    • https://inncredel.com/uploads/83723428394.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/8ea3f26f50a7bed522f978fa814fe5bd/37319310061.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/46830600897.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/fokikufujatitiruporub.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/250359bdaf5f8fc60591a93ef8d52416/88664902828.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/67413123911.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45edb597eb---meritinipazozebusazija.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/71343056224.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210901202956.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160775b14ec3de---susonobexudilemade.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161050189a0b2a---mavaw.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/jofiw.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/bapajugapekiwulapu.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/49353921669.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/f3abc6fd0aad514aacb581f9c373f4a5/tefet.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/96827786423.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ba2dd57e1---70111018258.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/94549314482.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/gosixodobuzulidokemava.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_off0000bc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC4A 16268 bytes
SHA-256: 207457380385b4768a181604f85a0284a4cf0958b269df6da1cd8f2709f11711
font_01_sfnt_off0000e5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BA 10892 bytes
SHA-256: 5465cc069c42d160d3f217d5b568c3d970fab24a2b96fa2abc2d6db0cf9f15f8
font_02_sfnt_off0000fee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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