Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d2d583171b550e9…

MALICIOUS

PDF

69.6 KB Created: 2021-09-26 22:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 01e94d9273cf987814dca67d79d17583 SHA-1: 8a5a1fc807c80c259e43f7934cf8762cc8da5ebe SHA-256: 1d2d583171b550e9ecf9d618a8174df44acd32a3b57ece9084f2abf9cdec0a7a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous links on disposable hosting and the use of UTM parameters suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cructi.ru/uplcv?utm_term=hotspot+shield+pro+apk+cracked PDF link annotation
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613923a4cbd3f---63706362192.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/17345934686.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/xuduga.pdfIn PDF document text
    • https://manhremhoangvan.com/wp-content/uploads/files/kideforexijelida.pdfIn PDF document text
    • http://tianfonmm.com/d/files/26172699854.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/3g4dm9juemmknjroqbrenoroh3/47770732208.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/motusokazegizajaxobiwaluk.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/68220562767.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/wopoxovoxetajokuwaxud.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/semulelosolerisomeke.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/zexisuguramumejevoben.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/20219161720372448.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/funir.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/rarirudaxulajejijopawop.pdfIn PDF document text
    • http://kahasat.cz/data/file/74118908876.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/a0b1ee302e9e0125f1ef47a446e93ad7/gigejetipetidija.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/17504365625.pdfIn PDF document text
    • https://gyvatukai.manovonia.lt/images/files/74074280288.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/80034698493.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/86713803516.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/22703031394.pdfIn PDF document text
    • https://el-tall.pl/pics/file/44949468597.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/64788266153.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/29815174319.pdfIn PDF document text
    • 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_off0000b0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0BC 14948 bytes
SHA-256: cd6421fe59ff18066bbae42dd3a130310d6edb3503c93c00a84d495ad4125131
font_01_sfnt_off0000d654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD654 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6B 10592 bytes
SHA-256: 33be14252ab71d3b6c8cbf8ac0a900860f5c6fc43000656996b94eb34a08c700