Malicious PDF — malware analysis report

Static analysis result for SHA-256 2af8fefda6e95f70…

MALICIOUS

PDF

80.0 KB Created: 2021-10-07 05:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8199f51bf2802b76972e049637b6e8ec SHA-1: f8f1e758634f3905d5c1ff423808b62cea704492 SHA-256: 2af8fefda6e95f70bccf459c9ef47304cb7b9c319337d00e3898f879fe2286fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or malicious link distribution attempt. The document contains numerous URLs, many hosted on compromised CMS platforms or disposable domains, suggesting it functions as a link farm to direct users to potentially harmful content. No scripts were extracted, but the presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the primary goal is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://boki.hu/editor_up/lizajakubupirafiwetiziz.pdf In PDF document text
    • https://peisheng.org/uploads/ckfiles/files/614c091a24904.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c7d51aa4b---maduborinumerimu.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/67765121258.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/a9c1389acdbc4a1ec080e6c30e00e464/82260848006.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/wuwuzoke.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210910031453.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/7780767249.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/37633825134.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/33812163994.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/26102657799.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/dumakejomamarasu.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/72228860545.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a14049e86e---rixebosofizigagilo.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/tudinewub.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/5ks0t11r7jr402shrbpurtc8q8/diwavobusaj.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/rakoviganifagesiloxitopip.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146e3d8d39c3---sojekipux.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/fajuputu.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210908_04812D7ED29C4042.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210909035550.pdfIn PDF document text
    • https://majubesar.info/contents/files/98608203061.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/95710145944.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141486e271c6---6783385002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=what+is+the+haploid+number+of+chromosomesPDF 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_off0000cd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2E 11120 bytes
SHA-256: 30d3a7f4db2a206c5ec42813d1c6d52dec24d4d5825343fa6754ba9fe1530b1d
font_01_sfnt_off0000e6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AF 20052 bytes
SHA-256: 4741efb3e83091eceef6f4588d37140f667f9e8ae1628dccfb31025e86d613c8
font_02_sfnt_off000119e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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