Malicious PDF — malware analysis report

Static analysis result for SHA-256 81274890ab414afd…

MALICIOUS

PDF

78.8 KB Created: 2021-09-03 00:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1bf49ac5d41e0573c5a5a0072e33a9df SHA-1: d08c0ec050460fbf9f6b53969cba6c81272fc8d6 SHA-256: 81274890ab414afd35442010cd6a40f8f9ee293f8ea4d665a55a7feed9940195
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The PDF contains a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. While no scripts were explicitly extracted, the nature of the link farm and the overall detection strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/ec72ad1130790c853a5b3e9e9cc07cbc/mevaziriragodan.pdf In PDF document text
    • https://jin-ji.com/upload/files/89491802358.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607329f212369---xapozibikejikaboba.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16109e18c05a33---relululokolovivoz.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/baforasasevosuzos.pdfIn PDF document text
    • http://treeoflifetolfu.com/clients/0/07/07f122ebb3396bb3f917f2e62af81596/File/85214469544.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6bf6709fa---19447901490.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/ceec39fc6494d995b9ba0a8964f26a4b/dukorizedonepiruka.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/duzukafiforireginevid.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/numefozidilevazebomaw.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/guxosod.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608541b64a9c1---87087778220.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75d66a6a2e---lojov.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210723_EA969A33595364A0.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/ffe9f8799ccd8bad2960b03f6f4c9052/monamobagajenogove.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bfcb208c3---90518879889.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16074fa8f1dfa5---bumixegofuxemuvavumog.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/ps9cfh8o9npnpjoeo05gsmoc8l/28327505298.pdfIn PDF document text
    • http://air-ned.com/uploads/files/xirimovamofumiv.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/5673444fd458b7bd53625e76c0c9fe61/jatifedonux.pdfIn PDF document text
    • https://kaimano.it/file/tesomulajetumojif.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083cd8e3671f---34761292624.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/92ac9864a16d62c67ab9e10e1aeb6c98/42039882524.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1610adffe69e2b---56394627186.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f77315098d---jodaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=oxford+inside+reading+2+pdfPDF 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_off0000c636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC636 20944 bytes
SHA-256: 8dd3953ae8333f899625fe583d9888f9cb05b3d5c6ce7416da78ad16cb6e5d1d
font_01_sfnt_off0000fc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC71 10776 bytes
SHA-256: 203fbe8f88448b55265207b2d1b78db403b1035dfc8558248cf3346e0c7b5d0b
font_02_sfnt_off00011539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11539 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.