Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a868d14c7b7397…

MALICIOUS

PDF

73.8 KB Created: 2021-09-04 13:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: baa9e5d8278a9b7dac8d54c44ac78ac1 SHA-1: ab61360a409e656431e920bad88d48f637b714f1 SHA-256: b6a868d14c7b739753ed044b541546fb8f2a37c7997ed2f6865070c8fd7a4617
156 Risk Score

Malware Insights

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

The PDF contains numerous links to various websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e6651cc2cf6---rilegepuwebetujas.pdf In PDF document text
    • http://lasfyy.com/uploadfile/file/20210728062827055.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/boxapumobupek.pdfIn PDF document text
    • http://babamoleskine.com/files/file/pijorupex.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b453b0ac0b---37622474621.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/40e61bf0b89128e567ad1f997a7ee96f/vebedadufuweno.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609566729bddf---29957827801.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/95581428506.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/cgv51rkc9tehbjau0r1mn9bc37/xebojozokedetaboxu.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e10e7a3bb---21967547671.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/iaghk7u2ggfuticj191t5r6a92/mumevunurow.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/70639278562.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bebcf04dfe4---nimupanedeviv.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/44642916239.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/kixejizi.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b9035c518750e2922cb49c1801adad17/jobadazefoxapexuduvu.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/555qosnijflot0jgdtac91mfke/rukunafedokutowux.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/23649495290.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16084a4bc47bc2---sivupunopupabomipekosula.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/060999813ad73e413bc5a4ec75c76af4/mirup.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/a34293fe63014fa7a8a98281e47c96a8/kejivazisixaxeberivoz.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/kipugulede.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/di9pnkrhcpqou8n3jtu3n23gvi/gekunori.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/8f19c59ba3a53a38921d234f85266285/93532720217.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/godimolukadena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=happy+together+chords+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_off0000bd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD61 16992 bytes
SHA-256: cf8023f72eea824001112c74f1229b3206729ff452a53d4343481b8eb67423f3
font_01_sfnt_off0000e90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90D 10764 bytes
SHA-256: bb1c272a12da423d70001b0db194ac2d479704b7717dd05b3b19fce459009a92
font_02_sfnt_off000101c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1