Malicious PDF — malware analysis report

Static analysis result for SHA-256 db638722a8387fea…

MALICIOUS

PDF

80.1 KB Created: 2021-07-31 05:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 57039ccfef27568f0330977f3ce9e95e SHA-1: 8274a5d72c952ff55736782488d99ff84f4a6e9a SHA-256: db638722a8387feaf0e36fd7c97f1d0285b2a1c1f28720313906cdf716049884
224 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and numerous external links, many pointing to compromised websites or disposable hosting. The presence of a 'SE_PASSWORD_ARCHIVE_LURE' and 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into downloading an archive (likely password-protected) or calling a phone number, consistent with phishing or scam tactics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=how+to+cancel+call+forwarding+on+nortel+analog+phone PDF link annotation
    • http://profil-metall.de/content/uploads/file/72419951098.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/f2b97ed331397381906b4a53163199b5/meliwuzorujexawetoboz.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/rkbdkku85c7571ssshqmp74q0m/kokedegutejafagipaturida.pdfIn PDF document text
    • http://octvads.site/js/ckfinder/userfiles/files/xakiledovogawupegafujeg.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/33772986998.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cadb207c33---59712385877.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/8596b71aeda9abb987a0a945f44623c4/89062590050.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c01162df3---70539948904.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/0ff576904af6b1e904c01539a3cbf9f3/suwitimoxadisuridolobefus.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/7d7f442faacffb9ae685a56d0a8a6acd/pebuguwokidupedaw.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1378499a69---numosujexopibopefesi.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/81698304369.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/44450972444.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8ef531907---luxusovemiza.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/xuxawevofefovuwalodo.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162513379836.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/27foand5qp0to4l9sfu8er5lsp/89429818279.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/29351446430.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/wosevali.pdfIn PDF document text
    • https://noddy.nu/images/file/xigewidivomojemagoke.pdfIn PDF document text
    • https://clinicscrm.com/img/files/buresedog.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_off0000d170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD170 17352 bytes
SHA-256: 21586d5d35af28faf264ac47a471f3c2e4e3d8dbe088437feda9617c29293a7b
font_01_sfnt_off0000ff20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11737 10808 bytes
SHA-256: 868f4dd0d0a5981030ff47d2261acaa953b821056acad4d4e76d306622258486

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