Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee21e180d8328e01…

MALICIOUS

PDF

83.1 KB Created: 2021-09-05 18:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 016a93c4fee1783c589c0fd58d5743e5 SHA-1: 423144a1645a511fc05a8393ab638e5be4a38470 SHA-256: ee21e180d8328e01871c114ffd121e4ed283fe8ab6a194d3e6bd79ec587adcaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to potentially compromised or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded links are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://glycocalyx.nl/userfiles/image/file/21559553130.pdf In PDF document text
    • http://dianacb.cz/userfiles/file/tureturajenusop.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/49155931515.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/77178c2796a2e5106196aec2be5d70a3/63849972287.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/xakiga.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/75252360949.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/zuzopizesafe.pdfIn PDF document text
    • https://people11people.com/uploads/File/53236745029.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/72183629610.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160805da64d028---70465014547.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a231da7b---78145865796.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/paguperatuzomimupevupozuz.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/lagetumefasidewifoniso.pdfIn PDF document text
    • http://kezheng.net/Upload/file/vujozixudabumo.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210611_160DB5AADE24D5BA.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc29d6ad6d---nasalomogobuwoduvaruk.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/hkqo256knur29glc5ko9ts2bu4/97139119750.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/zipowuwe.pdfIn PDF document text
    • https://allianztc.ro/files/file/4743278226.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/nolomujuxelumo.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7f72884b1d9f9736d1e3cb5753d9b6a5/niguvetufenewuxi.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16077bdb5471a0---basosiriz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=flowering+plants+and+non+flowering+plants+worksheetsPDF 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_off0000e029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE029 10932 bytes
SHA-256: 54fd8c91ab28a17119801aa85430bd9fbb9dd6aab247e06bb7659cfc15f59c71
font_01_sfnt_off0000f947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF947 17640 bytes
SHA-256: 85f17ff33b441a13cdfe847a71a9e8b709407918c558d5582416811fe16655fb
font_02_sfnt_off00012711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12711 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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