Malicious PDF — malware analysis report

Static analysis result for SHA-256 d80d021a7bf720b2…

MALICIOUS

PDF

84.4 KB Created: 2021-09-21 03:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6c567a095d56a63133bc54e0118180ce SHA-1: b61e341bba5a16bf7d5da68e1eb3aab118005a9f SHA-256: d80d021a7bf720b25d7636ca7f7dfee92768aaf706b86c3531843b9951986749
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many hosted on disposable domains or compromised WordPress uploads, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of techniques used to facilitate initial access and potentially download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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.
  • 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://laborke.ru/uplcv?utm_term=how+to+transfer+files+using+otg PDF link annotation
    • http://mtsp.by/userfiles/files/31261576969.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/23441015640.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/kedikelevapojofekoxi.pdfIn PDF document text
    • http://artediapharma.com/upload/files/60194631440.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210917233737_b0h2h7.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/14999901984.pdfIn PDF document text
    • http://abpaluso.com/upload/file/17555857837.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/futexowuvilalexi.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210909102943_YmlzZWR1Zm9tYWxldGVkb21vdGFqZXM=.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/67566553216.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/62780331110.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd2110bcdc---zafirosuwodasaz.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/zemepaxaboligati.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144bb7698628---donemateromesidivavikovi.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210910_DE6EF1A0E2F106A4.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/1f181dea9e96f4c61cc23a8f3174e42d/toxedaromebosadure.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210906142346.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/xipedolomejisaxav.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/38239808456.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210906011235.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/nerumaf.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/53310759686.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/boxulaviveb.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_off0000e5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CB 17628 bytes
SHA-256: 4ca9d8c5502410653f36857694439ec16440b0a9baf9179ca11d58eefc750a8b
font_01_sfnt_off0001135f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135F 10568 bytes
SHA-256: 62c2c0916d717b4f50b0635d3db129369aeb6e45022dc44da0ae40340d6f5743
font_02_sfnt_off00012ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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