Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe87ea77643c5530…

MALICIOUS

PDF

84.7 KB Created: 2021-06-29 03:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3e99cc18e7608c01dfa368810d6add5 SHA-1: e6a7beba1cadeed4d84feede8fc14e0f285a63c3 SHA-256: fe87ea77643c55309133913f6fc6a70061ed7f72255c4d24b59158f343580cad
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are common for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.allatpatikapecs.hu/images/file/84962796560.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c17d0d3d35---26826251163.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084fa7b8e1a6---bafemezisolawo.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/f6a9696888a75ff6f71e5a0fc2841137/47441020123.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a76c164a7c8---61099352136.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16085e3605e443---73459294208.pdf
    • https://llsindia.in/FCKeditor/file/jagigafu.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/4vt181v74nsmhs0mm8ka5s5hhc/15629717502.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9ce91b60f---43630069372.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d21140de5---gekufedubefokesul.pdf
    • http://progfin.pl/userfiles/file/54298910691.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5fa567819---36601345402.pdf
    • http://prograsifkalip.com/files/69576947592.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16089d0344ced9---fupowofi.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608088be3b8f1---vapujodafiri.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/6abecc9c545a51a028c674879c7b9146/33334091830.pdf
    • https://nsck-cykelmotion.dk/userfiles/file/kufuxoruj.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5516bf254---mapafomigegovarovanufigaw.pdf
    • http://nsdadventist.org/FCKData/file/jozoj.pdf
    • http://beadsandsupplies.com/images/file/38038736075.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/7dca793c827f2ed2ed22c8d9d1157353/62883711674.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5c7b0e7b1---fepuwuvezan.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/6d23dea355af70b74dd2c4b855dbed76/mubegonufo.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095aaa19b5b3---dovabowazixuxuxoma.pdf
    • https://okinawa4d.com/contents//files/pekemojolugabowamo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=free+robux+no+downloading+apps
    • 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_off0000e777.bin
e28d1ff276c61b154cab1b9b84ac31b759e88b415a899d88bc57d82f93cd7f6d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE777 17320 bytes
font_01_sfnt_off00011485.bin
6475f36c36373dc8aaef412157ea89daf8c10c180890d0fe0bf0fae85afa13b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11485 10876 bytes
font_02_sfnt_off00012d57.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D57 16792 bytes