Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac648736f348167…

MALICIOUS

PDF

84.6 KB Created: 2021-07-16 18:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35078aacb31e1c7c71f9724431758709 SHA-1: 69a0eca6132b74f9056068f69a3b7b7b550f63ac SHA-256: 1ac648736f3481675cc05375380095c002a9f5ee2a30ae6f3930c11ac96b5a2e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially malicious PDF files, likely to manipulate search engine rankings or lure users to malicious content. The presence of multiple links on disposable hosting and compromised CMS uploads suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/070512bf8c69e5eedbed1d6f53a69ea9/jujegesabumumekivido.pdf
    • https://adepotcustom.com/UploadFiles/file/20210429071959155.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b206f096147---jafuvuwejog.pdf
    • http://brava-ekb.ru/userfiles/file/pifewejuseragun.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e44590c5c---17171552533.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5bfd3416c---sasuluzosag.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609119af6d1ce---68305664218.pdf
    • https://biovuspharma.net/userfiles/files/bupavapuxudibenadixezisem.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/9b8d571b65b2b675752c486864778a11/27905210973.pdf
    • http://www.leasebridge.com/CKUPimg/files/91635348532.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26ac73c824---31594509040.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160e175846b9cd---xuruvopumosuleta.pdf
    • http://smclassof57.org/clients/34860/File/51112431085.pdf
    • https://cortopolis.ar/userfiles/file/tadevafewalupuvigomi.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8731e49d2c---12372899143.pdf
    • http://gruppocinofilomarsalese.com/userfiles/files/52849407403.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4909af867---leriwenas.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/4nnv7vtbo35i81c6ulbni6vj52/nogabasagemudolatikewotat.pdf
    • https://anyimaker.com/upload/users/files/tawunixizekodatapig.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/mudalofowad.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5cf597792---numufuxukedunaru.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bcac620f7af---13071578076.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=best+photo+collage+editing+app+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e85c.bin
f7b7e04d1ad34c4249ab138349e73cbd0c2bf535543530d5565db9fdf7a80a87
pdf-font-stream PDF embedded font (sfnt) at offset 0xE85C 10952 bytes
font_01_sfnt_off0001017f.bin
e2a69a882aff03e0615148e05d575b8df819621c2cf9dda6fc17d232f4d4e257
pdf-font-stream PDF embedded font (sfnt) at offset 0x1017F 16660 bytes
font_02_sfnt_off00012cdf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDF 16792 bytes