Malicious PDF — malware analysis report

Static analysis result for SHA-256 a95874a1c3e2b257…

MALICIOUS

PDF

94.7 KB Created: 2021-06-28 22:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7419ad66b54ae174e3ed94253dc7235a SHA-1: f24276958fc937b8e795c5556930a98d94babbca SHA-256: a95874a1c3e2b257362c454f6c1e7ca1365167184e7ff08177769f1bc78de623
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malicious content or phish users. The presence of numerous distinct hosts and the use of 'utm_term' parameters in some URLs further support the link farm and potential phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815d5db6f45---62897814755.pdf
    • http://entryexpress.online/chapter_images/files/39085981281.pdf
    • http://stark-tools.ru/images/uploaded/gefotuwi.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b27c20bd4---85355418040.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ce6fd9d05---13736502182.pdf
    • http://www.euro-fly.eu/userfiles/files/93695901187.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2150374f61---31580408611.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ced18d078---74777966157.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f9a35e57c---simowileterilip.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/goxebudutogusa.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607debdd9e991---vibawo.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ce7d1ceda---dejenidaje.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813617be0fe---gilexavotitifuvilo.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/576c453a6a1c729372cc0c96c883c35e/jafuvas.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16083f0e93b383---48829178187.pdf
    • http://thanuyentea.com/ckfinder/userfiles/files/pogetulatuteroled.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/2eba0c109e6f08d5229a72d48f6dd220/pajadisemodojazepe.pdf
    • https://leganordavigliana.it/uploads/file/41674196692.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc788bba7c---zasizoj.pdf
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/63088222577.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608316beef71f---16573334882.pdf
    • http://alituncer.com/userfiles/file/81478696629.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=wwe+2k18+apk+download+for+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000135e7.bin
fb82295bcb00e9bf706a5ba0d68480ca04b68850ae56344457a4d2473c645cb7
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x135E7 18560 bytes
font_00_sfnt_off0000ee93.bin
849b1cd3ba94a8c04345c3d39292ab1959aaaf30f6a3ae26e52e96b0f51288b8
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE93 17860 bytes
font_01_sfnt_off00011ce3.bin
9c6896c3c0c1cd2895b8547037da8713ea249d6df72e724c4754f20f7713f5d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE3 10776 bytes
font_03_sfnt_off00015348.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15348 16792 bytes