Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa1f3a58a5f8415c…

MALICIOUS

PDF

86.0 KB Created: 2021-08-21 10:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0b8dc0bc522d6776e98bc5de096a8633 SHA-1: 962d1c8c4c0fc4f4146952acc6780c4bcc0558f1 SHA-256: fa1f3a58a5f8415c5f6c8ea5f4b407995eedd2c286a63ba44ff0cb24bd188755
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, including those hosted on compromised WordPress sites and disposable domains. This pattern is indicative of a phishing or malware distribution campaign, where users are lured to malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature.

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 https://philabc.ru/uplcv?utm_term=pacsun+workers+dress+code PDF link annotation
    • http://helpibr.org/clients/f/fe/feaff840d005acecac0f151e8679c8db/File/bidorezanalilegake.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/fusetetijizurukege.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608267a0b1f5a---57140520378.pdfIn PDF document text
    • http://radfordhsclassof1970.com/clients/878146/File/pevuli.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/rikowiwevasulovute.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/bararakukawalimosufetuxo.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/wexurezavefifa.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/4ff0ae37f979f997609291f85ba39c26/nufijiv.pdfIn PDF document text
    • https://digireg.li/upload/jokefozegabu.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38863a2fd3---govawupoxanevirip.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16078ae34329c2---66989846326.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xutosupakep.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/20056352175.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3c61bba9da---bidezamamu.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/10867683572.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/29144227360.pdfIn PDF document text
    • http://chapelguild.com/images/usr/71267936641.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/66177810361.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1f486954a---75677132489.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831deb48def---wosunemoxekawadoziku.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/63975291308.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a155aba9fc9---lutagakojolexobadikoz.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/aaae42e6610178f7ff5d5e9529f518a5/vanigupegaxuk.pdfIn PDF document text
    • http://remobudostol.pl/pliki/jovukigomatemavesimi.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_off0000edc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC8 10408 bytes
SHA-256: 142c97254af728a841548b436c11a368d1953bed50074249c848ab4fc3914339
font_01_sfnt_off0001058e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058E 17448 bytes
SHA-256: 10da8c9dabd1fe8931da444fcb03c7d040f1e01cb2fd4332d760fde3ba2719ee
font_02_sfnt_off000132e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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