Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0599723a26e508c…

MALICIOUS

PDF

82.7 KB Created: 2021-09-04 18:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bfd3c6360e30563921a6cecec86ec8ea SHA-1: a3e744da3d85007345bc7910a84d94203be7931e SHA-256: d0599723a26e508cadbc7ef3c1b294e46e93c4f5a5d3ec5763e6f8b30b328371
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URIs pointing to compromised CMS uploads, indicating an attempt to host and distribute malicious files. The ML classifier strongly flagged this PDF as malicious, and the presence of a raw IP address in one of the URIs further supports malicious intent. The document body is unreadable, but the heuristics suggest a link farm designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095cbddd1f48---12378687020.pdf In PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/77911890241.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/xomovopesokemubexusugir.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/21083463977.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/vosokosur.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/wefumakoritixitevawa.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/ttmfr9oo19v66at5ck4tbl4314/16730281914.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/66225120858.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/bed8bb516da51de798f4b0b2523b683e/gikigupirovi.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc0a2c111f---gawudog.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/9807051112.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/39881473554.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/45638233210.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/vifikiruxudukofakoviniduw.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/3f903440e9c878e2c7332ddc7357f3c7/kemabuvalokobu.pdfIn PDF document text
    • http://pasted-radio.de/web/files/20939251549.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c08be68053---4553242926.pdfIn PDF document text
    • http://englishplanet.info/ckfinder/userfiles/files/pawojiwipaguri.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d69456acd9a---74028094699.pdfPDF link annotation
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/h3p0r23rrm9bcnlu07pds6ef99/7713909974.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e1527aeaff2---mepoduvadumewejujitax.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/49413184869.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/735bb9d4b0ab9bab1ddd9bfcabfd23f8/49963545324.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/9ca39691506ce0a3c31ae6539ffffd4e/raledafopuwexekadosusulet.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/cdrjie37mnismsj0focn23l7be/31958233882.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160728d6f25e39---rinokekefat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=prostatitis+cronica+abacteriana+pdfPDF 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_off0000dcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDC 10708 bytes
SHA-256: de8db2c2d1f9653c8f54dfc16e54fe2d8af0d52d1face5a90003ffa93d587bc1
font_01_sfnt_off0000f55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55F 18516 bytes
SHA-256: eeb2f9d5139d904689e9ed9641b21305fe833111dbd4e2e72644835881a3c23a
font_02_sfnt_off000124fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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