Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c4fce8a53b9f5f9…

MALICIOUS

PDF

95.8 KB Created: 2021-07-04 03:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c708ee0677825dcec13c3fdf34e11e8a SHA-1: 842cddc02a51bc6239e6c07733e85188aa7e5797 SHA-256: 3c4fce8a53b9f5f9cdcb31aebb9931b4826624abd2955943359f1cada274daa7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability or contains malicious links. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting an attempt to redirect users to malicious content. No scripts were extracted from this sample, but the presence of numerous external URIs and the link farm structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9486

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://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/5f43adb13fc1fed2ef12164a510d7ff6/senabo.pdf
    • https://alteanetworks.fr/img/file/84130932923.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9d642c1af---95689096989.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/016e4a581b55f4c755e0de20318216d5/52312933016.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090d779cf919---70847627037.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609473248bca4---wisitabagesumilaloveme.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9cff28eaf---sotumelarorujalowarix.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/fccd6796520f702b4af7ca5e9e68e234/fivelivegalotezis.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841adf18994---22304673390.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/03632cebeba58a4d3af35a526ca941a0/womaziruna.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0dc66b06e4---rurukobemobazotola.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6f0949618---xemozabanu.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/nl99qre8aboi3evarncr9q9dpe/vunideniwafokob.pdf
    • http://alarcon-v.com/editor_upload_image/file/rofod.pdf
    • https://mdteam.se/ckfinder/userfiles/files/91736158710.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7c84f1bd9---67421638136.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/e6a4991864dd62eb027538111ff340ef/vawitalozovowefi.pdf
    • http://cozycornerexpress.com/uploads/files/gopafowuwuwuf.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/hk42at185of0vc0btn60k12p62/9516529711.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/d64702984f28b10c9eb9f4177fa2823d/83201010106.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/nqb58c4rfrvgucbq1rur57h8of/miwabewepesebif.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/jo3mqre4ou2stgmabfdoa9d8d1/mukexipigurab.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/48a27c419fab7641072c9c037fefbe04/vajasiwerafosoj.pdf
    • https://rimsball.com/ckfinder/userfiles/files/6858175042.pdf
    • https://binarbaidservices.com/public_html/userfiles/file/91606293801.pdf
    • http://asustainable.com/global/file/wedizifoxuxisemi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=hypnosis+meaning+in+english
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000cfe3.bin
12c1f5f40dcf641e574749986d24bee9174efcd08b1744f61ddf8dcda602216f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCFE3 19720 bytes
font_01_sfnt_off0000f081.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF081 16792 bytes
font_02_sfnt_off00010898.bin
92bb7240e84acb0ea4bb8d8c3dc3732acd972d9ac7dd723bd78562fa17161607		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10898 10604 bytes
font_03_sfnt_off00012096.bin
f730a984a55b4ab2e9d6f709de9c76c4f705a9f62abf45e009b9a1a3b8b44bae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12096 25720 bytes
font_04_sfnt_off00015f25.bin
6a43a14d6ebcff20c28632c34ac5cd6b026ff9feb67451bec3bd2299763367ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15F25 4352 bytes

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