Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1c1bcf3f75ef0b…

MALICIOUS

PDF

80.5 KB Created: 2021-09-09 07:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2b258e22881d1c227875b59e6827d06 SHA-1: 247dc1ea41d0866b1a2835c77dc25cd17d370673 SHA-256: 1c1c1bcf3f75ef0bfc42dea1dab2af6331db0b8d183dbeaddaa4e99d6199890d
176 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structures and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://infrive.ru/uplcv?utm_term=ba+pass+full+movie+online
    • http://sungder.com/upload/subimabujep.pdf
    • http://jpind.pl/userfiles/file/selapotiseb.pdf
    • https://el-tall.pl/pics/file/21551808423.pdf
    • https://groupunsur1.com/contents/files/61234817335.pdf
    • https://xosobacninh.vn/webroot/img/files/49245882142.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/21a1bc057e15eccbc62f28c05a4356b3/gatanaretawotavotawaxazof.pdf
    • http://elosc.com/upFile/file///ITX202109041327483042.pdf
    • http://on-video.com/movies/movie_data/file/mowewuta.pdf
    • http://saringkarnwood.com/UserFiles/file/wositoj.pdf
    • http://hockeydh.com/files/ups/files/bijamaxuz.pdf
    • https://cpsguffanti.it/uploads/file/juzemadivozeresipilesuz.pdf
    • http://watdoenwevandaag.nl/upload/7768354842.pdf
    • http://filtrydokoparek.pl/img/all/keselawojumegiwe.pdf
    • http://pension-erlkoenig.de/img/editor/file/tudonalegavenozaxujef.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613894b010b7f---94675610021.pdf
    • http://gzhangqin.com/uploadfile/files/33599319918.pdf
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/fulesofezuselog.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139775571c88---26584397788.pdf
    • https://divinenine.net/userfiles/file/pomejewute.pdf
    • http://e-hematologica.pl/users/file/53431866365.pdf
    • https://lesura.net/userfiles/file/bokofizimokekujituv.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/bafe9ef21ae845c3d71b300db6f85f34/sufun.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ff841c616---nasogoxufakorebowibafug.pdf
    • http://opuspointpartner.com/ckfinder/userfiles/files/kibefunonomotazunaweboriv.pdf
    • http://quangcaosmsgiare.com/media/ftp/file/fifawapute.pdf
    • https://monographie.com/ckfinder/userfiles/files/63844228761.pdf
    • 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_off0000d803.bin
bbdf2e730cec595d9d890e75f97c2f75b4b06d7d30ee687f23f2d2f0a3b070f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xD803 17372 bytes
font_01_sfnt_off00010480.bin
86e7823122eaf36011f1d855eac4e61c72a8341e3fafde67c7963df9e501a4ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x10480 10540 bytes
font_02_sfnt_off00011c94.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C94 16792 bytes