Malicious PDF — malware analysis report

Static analysis result for SHA-256 5511c61635fdf984…

MALICIOUS

PDF

84.8 KB Created: 2021-07-08 12:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0b3175db271d3089b278facebaf2220c SHA-1: 3acaf3b0261e53e68f0ad64b34808727ea5aaf9f SHA-256: 5511c61635fdf9848e9f227c0fb1eadc577b3c047a275d04b3e63d44b9145ab5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a JavaScript stream suggests an attempt to execute code, potentially to download further payloads or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • 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 http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9b3e586bd---22028529848.pdf In PDF document text
    • http://terralindahigh1981.com/clients/866868/File/vetetetebabexotexo.pdfIn PDF document text
    • http://donghotam.com/luutru/files/banilinolixurugefogavu.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160747cb530a51---37133276681.pdfIn PDF document text
    • https://amblamy.ee/upload/file/zedokodeburuwosuxesuna.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/45457562594.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/lozogusixonu.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/rkhmpdklkqfqau7rtsg918drt6/ditomuzebebugukenekoron.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/tuwomifuwosofobos.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/bvebn9fe1svbm2rnu7ls95akl3/3727356698.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/d9593cb1680cd5435632a35989e18b69/fulewelavoz.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/c96758229e896c496f8fa692d6347a1d/rezeralisegejaf.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/o11lmgjpi5rtln7i62mlnpucst/54313406874.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/kapud.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/45563678531.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/bezod.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/fugazoxuligumezijona.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/77724320052.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/49584364335.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/6678583775.pdfIn PDF document text
    • https://hanomanberjaya.com/contents//files/98732185801.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b530ec6eb1b---80361201648.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///kijibujabubuxifebul.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/644752574db4ed2b3496956b88a93720/55075052779.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e27febf034c---sexivasowexisu.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/152a7ec2bcbaeef7b1cb1b2a55eb0f4e/55539142932.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+do+i+get+more+stardust+in+pokemonPDF 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_off0000e61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61E 17560 bytes
SHA-256: 4e043083c4436413eee339574466eb8857dee4b5f243007ba3878592e0cb62f3
font_01_sfnt_off00011459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11459 10960 bytes
SHA-256: f0f0ba21b9383c2846aa124b975eb20581ed8e98eed9acf7fe7dba0f5b2889b7
font_02_sfnt_off00012d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1