Malicious PDF — malware analysis report

Static analysis result for SHA-256 081b18cfa362c91b…

MALICIOUS

PDF

84.9 KB Created: 2021-08-03 22:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0d20a53c52ca0d62df2c846496053104 SHA-1: 5348c67d5b3f8af2809f00c473ce32e485df4df7 SHA-256: 081b18cfa362c91b2ae24365d29bd574f59c9bfe06c2304631ac3ca57b24cf4b
184 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of a 'download button' lure and callback phishing indicators further supports a malicious intent to trick users into downloading further payloads or engaging with fraudulent services.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=physics+objective+questions+and+answers+pdf+in+hindi+download PDF link annotation
    • http://files.ibiza-ferien.de/file/28555135271.pdfIn PDF document text
    • http://sbcnepal.com/images/file/dupaxozanuwamimaludufeton.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/4c0880fcnqvt0rdhaqau1j5ns6/69227007191.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/6c87de61cc733a98430b469e4a29dc57/jiledijemujapeku.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/zovidefikelimomovuman.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///39183244232.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab768b43015---58651620484.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805280ee173---62290543717.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/c80782546ba785152f821d0c4b4a5e2d/vowazufugenabuzurogu.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/945411332569202167f9c9c9e64be162/87996258972.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/komubez.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ef0798fd2---sadepenibeko.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ee379b6c0d2---sujikaposefekud.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7056dc1f6---zazukobajaxemurosubuno.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/78881609653.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baacbe04e8d---nogemojul.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad8e61f215---vodenozoked.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/nugoxipadinidufex.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/c4521d033c5802149e14419b962eaf6e/94263874771.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/68660672343.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/88195175638.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/runesunavinijapixi.pdfIn PDF document text
    • https://bombapin.com/calisma2/files/uploads/90098941398.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_off0000e334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE334 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB46 17308 bytes
SHA-256: b2c2975b1f6e44cd20a3c1b33c774838cb759784ff6be017ec9c35e4580fb7bb
font_02_sfnt_off00012875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12875 11500 bytes
SHA-256: 12440cd23c97fac5dcb609da402462cb485ccbca3f4d9fb00eddcd3ba9bc9597

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