Malicious PDF — malware analysis report

Static analysis result for SHA-256 829ab9afa5d1c5c4…

MALICIOUS

PDF

70.1 KB Created: 2021-09-26 13:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9308affd0cf9a7da56296f40973745b4 SHA-1: de7b434f74c06829eac54781edc160ba485a8d65 SHA-256: 829ab9afa5d1c5c481a2ca74368feb05af7b7cd6e976ed62cdc6184fdc244a54
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://allytemp.ru/uplcv?utm_term=companies+that+use+push+and+pull+marketing+strategies PDF link annotation
    • http://lawngo.net/fckfiles/nuzis.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/72268414063.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/62879358324.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/kogasazex.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/sujawufefurajufagag.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613710dae31c8---85752177545.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/54643603450.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/18570200423.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410e5c7a74e---nunanuvejewir.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/vovozekumo.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/pikilijuligesuwizoruzud.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613870329b01b---tenetulirapewipumokabizit.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/gatiwojinu.pdfIn PDF document text
    • http://allasclub.com/campannas/file/ditagut.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/53661502685.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/fubunatusuwoxifamimer.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/wesufidexodibetazetegokiz.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/viredebakadig.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210921075625.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/16458491893.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/tudetejuwojutupixuzawujab.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210918170425.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/51382402671.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/66395393448.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/19290052101.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_off0000b0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FD 15884 bytes
SHA-256: 3b380c549d361e404e0629ad37721fe310f4a88287f81f77d7e2e1e127660735
font_02_sfnt_off0000f156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF156 11060 bytes
SHA-256: 5a1e3e0ea864cc1172ee41e7047c184ff75a29a2f8ea56f4e6c19bc79808d1b4

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