Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c014e89f64ddad…

MALICIOUS

PDF

93.9 KB Created: 2021-06-28 04:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a87a2abc2844660974ea90aad754b076 SHA-1: 5bab7aaa5e6c7dd48bf8ed506ab1afcbd0af478f SHA-256: 31c014e89f64ddadce6cac886b1bce19bfa57f9a8a4f3b38f4037bd18cc5fa35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports its malicious nature. The presence of embedded URLs and the link farm structure suggest an attempt to lure users to malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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 http://gdwtechnology.com/fckeditor/file/68749539365.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/9hkt4gh6ihleqh2eioeisverv4/77622822762.pdf
    • http://alkanboya.com/files/file///gekadaravot.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/aeun04f34ivdm5bgl3lvmtmt6a/senekegujigonimenaxokejof.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/0ps9b89qnple85n7jnj1apvuio/nusepumor.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/71af62dbf3f61b3285a26a405c0a04ca/dotarekazape.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/g0oebcpejcnb9g9l73mstotc61/2729491419.pdf
    • https://uleiuri.ro/userfiles/file/65941939817.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbde43e31d4---20950837720.pdf
    • https://alexandrapanayotou.com/web/images/static/file/fenamikadadilirafij.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/9461de7a817e7b6ee0daacf33b8a9238/85512602874.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/7719ec94e398b3dd8de36590be22ffcf/30315712233.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/3aa89b2e08290b6ab49b2106ff44389a/97083647548.pdf
    • https://wagaskar.com/media/54278315338.pdf
    • https://serka.com/serka/upload/files/67224970391.pdf
    • http://bjbtrh.com/files/pic/file/70680484460.pdf
    • http://dailyxedayhang.com/userfiles/files/nufadixeko.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/0e1829ada246b982fb82a2e51da50ec0/xojunexepibu.pdf
    • http://119hero.kr/userData/board/file/sanokepuxi.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d324352bcf---kiwiwokagaxabekifoguwi.pdf
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/280132549110.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa5bbd5a54---dolovepisetubisofu.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ca2612796---legidalo.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/935bd1cc192c6a94865a95c41763db7e/sibabuxojut.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=white+rodgers+thermostat+keeps+saying+low+battery
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f249.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF249 16792 bytes
font_01_sfnt_off00010a5a.bin
7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5A 16312 bytes
font_02_sfnt_off00012061.bin
36f619d7537e018a3d2f04c8af572e119625bd300823cf36a3f5e55963a19417
pdf-font-stream PDF embedded font (sfnt) at offset 0x12061 18004 bytes
font_03_sfnt_off00014f72.bin
028828be33d6df2a5347991e791ad56f626088f25090b639e3b16cd696d030cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F72 11264 bytes