Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6ebb2c3b1281370…

MALICIOUS

PDF

83.3 KB Created: 2021-09-02 17:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a8248cf2d4f143707e820dd54343c085 SHA-1: 7109536358cc064411ff664b87ec54311325b13b SHA-256: e6ebb2c3b12813704a3fab9f0cf79ca6d60c23b854a8484a5919e62524d27668
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm for malicious redirection. The ML classifier strongly flagged this PDF as malicious. The presence of embedded URLs and the heuristic firings suggest the document is designed to lead users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://omegapizza.net/uploads/files/66476691083.pdf In PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/svhfrrrkd3lqri0loivhfq00p6/36468862860.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210617103459.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/mozetepuzevidowatani.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///xebefi.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/kojukurewusirini.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/vazana.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/21ec0c7274cdbbcdd82c3f29d65bebb2/50743633968.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608380717865e---wefarifekedomevijugi.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaa6476654---77603752622.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160848624a8ad5---33509312749.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cfa31aa32---17130595219.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/28480998661.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/75119905697.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/20895158570.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/rf70lgr8m9s460dkpc7gvjavdl/gesuruwunirati.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/63266096584.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/veguvef.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/8404804094.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/a9a887c92f2397b64b81daf8a71c923b/50142888540.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129b29fbb737---14820785996.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/ledidujepazewarazi.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/ephvn3nv867raa6ig7u9igd54d/89619174131.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/94970029122.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/48106750885.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/j7p6nnti8t3q1m885h57vkb1k6/naxepasutugepoko.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ed272a863---biwolafajumufixase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=addition+and+subtraction+worksheets+problem+solvingPDF 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_off0000de7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7D 11424 bytes
SHA-256: 113410aaedbb08cc6b25945e530ea564e3f3d5b340d6b65296d7dc6a56699646
font_01_sfnt_off0000f8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001110b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110B 17840 bytes
SHA-256: f06ff79c440c65b36d7cde16be3e53167597271595671dd73fe59e9339a4eb75