Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad4ed7bd376aba42…

MALICIOUS

PDF

83.7 KB Created: 2021-09-02 14:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 349366c5395e9a087dd19642671f73a3 SHA-1: 3e1e255a4a5a6a994d5c9f25a4a8f24c5a863598 SHA-256: ad4ed7bd376aba421542e92c4585594db55fedcaa67a2bb55e1dbf155ee7f387
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, embedding numerous URLs that point to compromised WordPress sites. These links likely serve as lures for phishing or to distribute further malware, as indicated by the 'SE_INVOICE_LURE' and 'SE_URGENCY_LURE' findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3b98ab0fb---86893330193.pdf In PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607832373b674---wiwetodavesexureg.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6c8172f6e41cbcb0fbdc7dcb061347db/93219626845.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4f38b3dbdb0143d368e7326403a041af/97749311701.pdfIn PDF document text
    • http://amdind.com/userfiles/file/fabutogewunepuw.pdfIn PDF document text
    • https://terryhaas.com/wp-content/plugins/super-forms/uploads/php/files/f9cf9aa049fc12dfac77ccb56dc5edf0/vufekegoxexad.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210609042203.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/zifegikapi.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/vubitoramapobavoli.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/kepesodiwete.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/2aqo8778rnahuh1bh8k4oeuvjj/vafuvonorenipozumixu.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/a8ccb355429909096d313ca362c3ea18/62830662417.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/naxejolopujovibagetevegiv.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160876e73f2ef0---83488013408.pdfIn PDF document text
    • http://whitebearlakeclassof1970.com/clients/0/05/05755deafc47004aae723e515cf08a6f/File/kidulajutewosala.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/23511241079.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc59f1f31b---76938493155.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/bubodiwulak.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/22oi73034g921nptaau6oimf06/saniwus.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16095640327bc5---fefusonozevo.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/mubupidudatalubomoguwa.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210623054301.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/d9edd706582615bceb572569063955dc/3823238458.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/97622939998.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=demand+letter+for+money+owed+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_off0000e26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA83 10600 bytes
SHA-256: ec5ec947de93b70b4f18faf323b982ec773271f848030ee82a3bc489b44a7bc3
font_02_sfnt_off000112c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C1 17756 bytes
SHA-256: bd92c465be4c19223373b0f610998aa744fd54ae21f700e028884656409931c1

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