Malicious PDF — malware analysis report

Static analysis result for SHA-256 170ca5464db2fe53…

MALICIOUS

PDF

76.9 KB Created: 2021-09-20 14:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0f00452a147e7bdd59ed574136476f44 SHA-1: 4021776e9bee6c9e7ed20ad6a07b1332663f9d19 SHA-256: 170ca5464db2fe53f593da4565b043d267441375ce027d6f5f4d9d9be1be6e85
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting, suggesting a phishing or scam lure. The heuristic 'SE_CALLBACK_LURE' further supports this, indicating the document is designed to prompt the user to call a number in a deceptive context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://catamma.ru/uplcv?utm_term=codes+noob+army+tycoon PDF link annotation
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/a594f0bff5bcf55ef99bdd3d9233f952/kexakugusewatajapa.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147b6abd3751---sofajixitan.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/54422033397.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/66608777301.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/kadanutazebenukigubuw.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/kugezajurovawalizosidet.pdfIn PDF document text
    • http://jsjxh.org/filespath/files/20210913133211.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/cb337hkdi5jddvt2ctpcqa6isb/92522917905.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/tifapur.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/mavururatulan.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/pupijeronosilux.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/527af3225ed9b3d9d4692727fffb68a1/xabunipitelexigo.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/zarokepupoxolu.pdfIn PDF document text
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/77468142838.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/35053780214.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/noxodaziwirofuxufoso.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/54200450515.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/49767590294.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b133347760---jopawasipowefawezekeku.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/41766778096.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/7473507950.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/45022899055.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/mowasabotosowin.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_off0000c6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF07 17936 bytes
SHA-256: f9bd6d900cd174cdad336fcc1f649f1d60fc48384a85e635b9c8c5f58696adc0
font_02_sfnt_off00010d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D53 10676 bytes
SHA-256: c0413bca2d8553723581fb91635a86a9f1d8abe12b67149b04fb04f07b809940

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