Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae44cb5a61f89d3f…

MALICIOUS

PDF

116.8 KB Created: 2021-07-18 23:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2e2af227ddbfdcde66ac44002b155569 SHA-1: 65221f9875e0157f3cf00f569a461f72214c4900 SHA-256: ae44cb5a61f89d3fdde47b70d2caa53f0f17520e422fdaa709a18aad6afb3e9c
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URIs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier also flagged the PDF as malicious with high confidence. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://polskienarty.pl/data/aktualnosci_imgs/file/mazewitaj.pdf In PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/663b6b66b2631b5bb4e6be06c889e45a/ragozejomu.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/93558816012.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b83c67c4560---91120421179.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607e43ba86d40---venipuzuk.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075451d82e4c---butasulefobiwu.pdfIn PDF document text
    • http://bruningfoundation.com/clients/9/99/99acc79c432c4c389b364f5b25189af3/File/vogog.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/db282b9907ae45a8066401d9cea46b8c/ligumulisegiweti.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092323996788---nujejo.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/46324341721.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/ad7bccbacd5811f4d645547304082625/80506171962.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/58324458644.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/jeripaperigo.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/mixibo.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b340a7220a9---pejavogenus.pdfPDF link annotation
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9ee1ce92d---dasinosukok.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084dbc66c787---98736274619.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608540e975ecc---33818962924.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/58733868073.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/26217197103.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/xilidamukekamema1622546564.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/7374add8ea0345bd02ef2e16f98f2fdd/36326171816.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=fire+force+episode+1+freePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12823 22308 bytes
SHA-256: b8a69e1e176dac2f9a19beadc8011585982e644b7e480b7b55963ba2fc5ed5f1
font_01_sfnt_off00016937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16937 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001814e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1814E 10232 bytes
SHA-256: 82a3911116c9603f7577719305ff7503a394e5a3ddf1dfa1ef4f1ab189ea0792
font_03_sfnt_off0001985f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1985F 17572 bytes
SHA-256: 2dd8a33a1ba9a6cc326ac5e5f878f45d53b8fd6565c5bfddeb7f4c88724eccd1

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