Malicious PDF — malware analysis report

Static analysis result for SHA-256 22bfc0e88fa36f3d…

MALICIOUS

PDF

71.8 KB Created: 2021-09-04 23:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 40e47963d202e01f0742c0d87c522066 SHA-1: 37004902aac8ca395e322c998e6bc2e797614bac SHA-256: 22bfc0e88fa36f3df4347b6495b318f6d2a61ded56e9b9b4795cd4149101bfda
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs and the nature of the heuristics point towards a spearphishing attachment as the initial attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddeb299407---kelebulonowazudosaro.pdf In PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/2ba08e20735fe2ea7b752c6afa7b96a5/bifuperafazakeriz.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/c317cc077ad43967994f71a59ca4d5a3/godofekebusalurazalux.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc8f55bec5---41843186263.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d312df7604f---nuniruxana.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ecc565983---kabutunivadewigo.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/e5fdbea091ad68275629b301e181ea60/pisimabes.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/96828652037.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/lupoxarujoxelufapamexexir.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/245772fe23f8f25b729aba18a1a9d497/67703935235.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/mumod.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/tipusito.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/zisakoneru.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/dutumekazawinapofedufez.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/sesop.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/63930112478.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76dc4ed4c3---lidodositinazub.pdfIn PDF document text
    • http://iphysiology.ru/upload/lirotov.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d79d870ac---vixegurudetewaj.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/vulabi.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/sikorekidizifaruwe.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/78310112597.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/60328574381.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/xudewulevovavugagulus.pdfIn PDF document text
    • https://securitydm.com/slicice/file/78167330407.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=area+of+triangle+worksheet+year+6PDF 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_off0000b5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE08 16672 bytes
SHA-256: 57c024a45cb7ba26894f8cce3948f442331fd8b846d3df2ffeaa5122f2592a7c
font_02_sfnt_off0000f7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7ED 10932 bytes
SHA-256: dfa4d235b9f8d786cece7a8e08d308528c1504dac0da95894207f6527bcbc072