Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ba9558219c1140…

MALICIOUS

PDF

82.8 KB Created: 2021-07-09 04:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ffcba153ccc8ef23e7ce445d4f791d2 SHA-1: c812a2e8b8ae6474666fcf9047c95ddf955e823e SHA-256: 52ba9558219c11406a741348e3797e83e76561087e3a966ada9d4653ea4369f9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript for malicious redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://longarmacademy.net/fckeditor/userfiles/file/farizobunilogoresegano.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/f8dc0eb4ud75qq01ckuhgm1pa1/rukuwigi.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/6a215ad90dfdc22bce27ecbb5f67f235/bokaxalilumi.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb073be71dd---89837158306.pdf
    • http://akademia-jedenastka.pl/zdjecia/fck/file/difonupevo.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06c3b3088e---bujad.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/9t9873epk7s3p48g344h7hstsb/kenogokilanakor.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/mennea6jhjvgq2j4pe39p5f971/jaridiwox.pdf
    • http://e2ingenieros.com/ckfinder/userfiles/files/955636385.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/09mslitc3uf2astidi574qsbn7/gazuzet.pdf
    • http://vietnam-intraco.com/webroot/img/files/34844282025.pdf
    • http://ziconiavip.com/uploadfck/file/laramebilijupo.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16080d832f231f---36890675783.pdf
    • http://zovsh.com/Uploadfiles/files/jitorawuver.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f5217a5b5---labaxarivuligab.pdf
    • http://aihyang.com/userfiles/file/48418576475.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078dbde02b16---46797301925.pdf
    • http://banghetretunhien.com/media/ftp/file/porijivolexavagufe.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a14190c7a6---kadowipubosigenoji.pdf
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788b0da027f---rajerugololigix.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071e09613269---sokaluf.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/74ffe0bc398ec2bacbae388bd143eec6/60898140838.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160754f3d4ffc2---kodoxiriguxekilulino.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=food+chains+and+food+webs+worksheet+answer+key
    • 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_off0000e10e.bin
ba1522871fa9fa4aa0dbaf4be18e8fb07041dde279e25b60105cb8a04ed8b53a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE10E 10936 bytes
font_01_sfnt_off0000fa6f.bin
b4cd865f5b3308275eba58a1bdb7e2061d67e43017db9a1e094dad66f654f14a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6F 16788 bytes
font_02_sfnt_off000125ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x125AC 16792 bytes