Malicious PDF — malware analysis report

Static analysis result for SHA-256 de1fc8e207ec1272…

MALICIOUS

PDF

78.7 KB Created: 2021-07-04 10:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a3109491bad710fd56e99f5c06e06c63 SHA-1: 8beb350dfb40a3c516d084a6ab874ad8f948c6ac SHA-256: de1fc8e207ec12729fda5cb6ee8cbafba256939a0e725ed644a124d8b5e94605
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. No scripts were extracted, but the structure and URL patterns are consistent with PDF-based malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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 http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f81f135f03---wizidopitoseloro.pdf In PDF document text
    • http://dok-vo.ru/userfiles/file/jekorolusibinezikid.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/2f9a41034713c3f37ecb2afd381de693/zukewekolideburabote.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/7ksh0r8qil96svt5kajklfollm/26605468316.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a94334c90d0---17185929779.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/62959803380.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/lulogovul.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/24267826222.pdfIn PDF document text
    • https://aedwea.com/upload/foto/34134460160.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/n2bri2ha966pqina8vo0v2muue6snomf/35454828904.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/dhg15t1mlq66kb9sv5t73s9vm2/70803959839.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983fa99e494---degegesewisuj.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a443d3dcbc6---gaminokapokepigunekopanu.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/24bfae7d1413561f7e09f6a4b8442cb8/5441050522.pdfIn PDF document text
    • http://yaheardfamilyreunion.com/clients/6/6b/6bcd2b4031d0b832efcfffe4b90de728/File/39956510165.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/qkg23r45898e8euiouovr321r5/kupukexite.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8741496ebb---sinabatugomusu.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/wuvefesuxagozadegosuvepi.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/jelafa.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/76102066223.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/c60d624323256a4bf88a7268ca54d378/52617411814.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/duzepexizajurifuririg.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/67899227460.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/57377200536.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/40436991748.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd50bd3ef13---17172797619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=rolling+hills+townhomesPDF 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_off0000d1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B4 17000 bytes
SHA-256: 5cd63bea719dfde61c98406908d12edd81d68c203332dd64bcae9d48e2d9657c
font_02_sfnt_off00011604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11604 10424 bytes
SHA-256: a9b98fd54f3beb9092c1876f9012d58ebb21def25b38864202b11f5886e462e8

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