Malicious PDF — malware analysis report

Static analysis result for SHA-256 8693a00be3992e1b…

MALICIOUS

PDF

70.9 KB Created: 2021-09-03 15:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: edce2b17d19876f36cb31240a8a334ab SHA-1: db9fae2180bbcd9eb92f153fab46c3a8cf2285de SHA-256: 8693a00be3992e1b0fae0f3379bc523c6309aa54be4749c3709e2218f3ea4d94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various domains, some of which appear to be compromised WordPress sites. The presence of external URIs and link farm characteristics suggests the PDF is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://philabc.ru/uplcv?utm_term=c+program+loop+pdf PDF link annotation
    • http://planetamama.ru/files/file/28594306657.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf83ee35d83---15059838467.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/15450216451.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/d1fbf6c4da6047e347884396c40bec54/83257689207.pdfIn PDF document text
    • http://leakefamilyreunion.com/clients/63964/File/kapaxatopepotidi.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/98571935677.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/bulef.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebcbc3111b---fukirazonasebames.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/mulig.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/r41ftr5rvs9htiobe7uv6p4aqt/67599517580.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/1oacmp3j2254ctdceo5olm3md3/jewoxiwaxeta.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b555a6057ee---wudezemorefutogizibej.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/6cc7e16984587754b7409980d4751e9a/93133507022.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/98622233976.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/63248014484.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/e14173084bee0acca209b4bdbb2684a4/nonokutixad.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/gapujez.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lujuwugujikiwitizifipokiz.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/donoj.pdfIn PDF document text
    • http://gphs84.com/clients/866382/File/zegurimim.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16117e45db9a4e---wivipatelikixis.pdfIn PDF document text
    • http://xn--kprq5pvqklteonubj6c.tw/CKEdit/upload/files/32058500169.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/3b646b514b6656ea34cc928f3d5197ac/rivawel.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_off0000b64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB64F 10280 bytes
SHA-256: 28c0faaba5d7d1f16bc90c340092768578af447e2526837936ac8eab6b0ae3f6
font_01_sfnt_off0000cd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE547 16076 bytes
SHA-256: e72a346db33b3b4051282bbdc3749636f8da8a65676c31d922fe5c0bf705c7fa

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