Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd4211438d545e4…

MALICIOUS

PDF

76.8 KB Created: 2021-08-22 03:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 38758f5ee923f0c9ee3d01a3149ff3d7 SHA-1: 298bd91e16ae36a60f7b2ce419e47df8f22d3eb5 SHA-256: acd4211438d545e4be971d46ae5859c926fdc390eadc145517b768b1304004cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external URIs and link farms pointing to various domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics indicate that the PDF is likely intended to redirect users to malicious sites, potentially to download further payloads or steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://allytemp.ru/uplcv?utm_term=lipton+ak%C4%B1ll%C4%B1+%C3%A7ay+barda%C4%9F%C4%B1+oyna+ger%C3%A7ek
    • http://fobosgrunt.ru/files/ckfinder/files/902590619.pdf
    • https://beysukonaklari.com/ckfinder/userfiles/files/40825533788.pdf
    • https://cottonweb.net/userfiles/file/tafutaxejezubetevuzog.pdf
    • http://tns-china.cn/editor_upload_image/file/timujegejijutezorakeva.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/71qmrse2l0cqlm9ijc1b3m5vd7/83146186553.pdf
    • http://hzdshg.com/images/upload/File/naveroj.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102c8e1df06a---15788227593.pdf
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/xutukidapufovaz.pdf
    • http://nprofit.hk/userfiles/28030537772.pdf
    • https://cemb.ca/upload/editor/file/muzebo.pdf
    • https://cakesandcupcakes.net/userfiles/files/vutikidojasukopivur.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9721939e2---mozew.pdf
    • https://mimpishio1bet.com/contents//files/60207804164.pdf
    • http://noithatmfc.com/media/ftp/file/56544842103.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdc678f00f---52914629678.pdf
    • http://maility.pl/_ADRESuserfiles/file/39854223917.pdf
    • https://indikino.com/ckfinder/userfiles/files/89285767145.pdf
    • http://infoegrafica.com/userfiles/files/bogavowufemifexadunifig.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/d8311a6dff272d959b1034d5fd9ffa7b/45970098036.pdf
    • https://ferest.ro/imagini_ws/moxikopugotozinonutukizus.pdf
    • https://cafe-malaysia.com/contents/file/lonogiwowazamudi.pdf
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/fipoteruxasoniw.pdf
    • http://paillasse.hu/userfiles/file/zizisi.pdf
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86510439751.pdf
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/xogudenijelojazejaximefil.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f04f0b70bf5---50265776042.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c0996264580---65555026874.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_off0000c634.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC634 16792 bytes
font_01_sfnt_off0000de46.bin
ece35d557ec3abff444bab2889722cecb993ffba47b95f2bc171243bf7242100
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE46 17784 bytes
font_02_sfnt_off000109d7.bin
2fe3d2497acface94bf699b4e6dd3273bf42209680faebb66634f5eb31a59e99
pdf-font-stream PDF embedded font (sfnt) at offset 0x109D7 11180 bytes