Malicious PDF — malware analysis report

Static analysis result for SHA-256 e20f3648822367e1…

MALICIOUS

PDF

82.5 KB Created: 2021-09-04 22:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eb13ca9c31274b79aacc31ca451c6fc2 SHA-1: f8cc6368c17a241b35661800da006bc4c5b5cf87 SHA-256: e20f3648822367e1b90723d3ea4c684007201c586a1cb375f5fd866f754a5020
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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://www.zywawiara.pl/pliki/sajetedebofewaxuvif.pdf In PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612599a586c76---tubamudasososilepubak.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/wuvokoxutabizudi.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/4697349524.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/dib64b9s9784bneq3r4764bp80/93980712671.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/lozitedisugiwafakemokugez.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/50214744483.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ff5576aa96---73050126802.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a66390bea5f---dajemek.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/dowomarodetoputus.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/84713986244.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/80417941052.pdfIn PDF document text
    • https://msvadba.ru/files/file/96655432909.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/2aced60c65402a14dae8b8b961878da9/41248639869.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/e6ae6b6b5cd5bc31e84d39c377a66068/78801138877.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/finiridakupabanixolijuxo.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608fffa2740b5---xatuxefevowijoke.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/782a1f2380323b78ffecb71bb3152e17/24625334127.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/nobujilobuselufov.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/3c65a8addd06f541b1633f275eb7f79d/vonevoweletibub.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/tuwafumali.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160728265e2878---41181975468.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=nervous+system+practice+worksheet+answersPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3F 11028 bytes
SHA-256: 11e7ea6a53489d2354eda6261d6aeb5278418f59e6840d070a6c636610f9ad63
font_01_sfnt_off0000f7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DF 17028 bytes
SHA-256: ad2be34d29ce460fea27423a6d1729fb451c9f0a0be6b647066cc40650cc83b4
font_02_sfnt_off00012403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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