Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0760c6c9ae38507…

MALICIOUS

PDF

86.0 KB Created: 2021-08-11 21:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4788b3282bb4e8bf6b12bfeb9652fd73 SHA-1: 582b3d578442816e50a15ddf22aa9b4ab482d69b SHA-256: a0760c6c9ae3850705c3ad995ee3661f9455628f9e75f39e7bacdaad74a43e99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, many of which host other PDFs. The 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics indicate a pattern of using compromised or disposable hosting for malicious content distribution. While no scripts were explicitly extracted, the nature of the links suggests a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://teplospectr.ru/images/files/xuzoxi.pdf In PDF document text
    • http://altiro.nl/home/tjerk/file/27754490676.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/vuzilo.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/b2d0a533143232d793aedcd93118424e/mabekekidifapa.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/gmk3nnp8n9a9dj2jn0r503qols/31904675181.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/bazax.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/ctpe5q5sj5uib41iuu7tfblnem/72343777336.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c50937cede4---renasukaxari.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/9e99b9f7392e1e060ec22f2c2a479acd/35241496096.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/22925288491.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/83624907760.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fb5751d432e---91270195183.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/30747378284.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/32334927192.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b7d20acb4---xotogawane.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/mudopu.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c74a1ea303---28057096518.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/21161992733.pdfIn PDF document text
    • https://totounited.com/contents//files/21450756719.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/xujubedopidar.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5130820e1---91780190910.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd02d855263---98205866286.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/39688062905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=driverpack+solution+good+or+badPDF 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_off0000ed16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED16 11088 bytes
SHA-256: 37793d9e8b210734b1241437fcdaf19f8c079d44ade8313caa8831f1fae643d4
font_01_sfnt_off000106b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC6 16628 bytes
SHA-256: 29e054887eb3fd6c4ecbe2b471878624c211c1b6a49c599e2ba3411e85bee441

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