Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5514d1e3cc3e208…

MALICIOUS

PDF

84.5 KB Created: 2021-08-08 16:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 387b418e21b0537f5e74a58362c32f61 SHA-1: 220970cc547fad3a1d4c90ae53d7662dca4c478e SHA-256: d5514d1e3cc3e208964028129e12f1709b53ff4235cf8ddf915ef314cbfb9aca
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The presence of multiple PDF-specific heuristics related to URI and link farms further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://transport-vehicules.fr/userfiles/file/dujefupilez.pdf In PDF document text
    • http://brmxn.com/userfiles/file/20210719041942_9h1ygc.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/967f9dhnne0udijv5js2krv293/72277965802.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16fe88129c---94238341399.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/zuwozipiwudisolewubobopo.pdfIn PDF document text
    • http://unseretochter.ch/images/file/mabosanafozunirelosa.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/0b2a9ccfaf137fb416250c0cc1f114a6/ruxojefixuferesepofugora.pdfIn PDF document text
    • https://pecsikult.hu/files/file/94284283356.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/a8jqrm9i6tjvvevpu93akhp5k5/99914768082.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/10500327103.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/towezalojofe.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/3t15t83s8n0gl6su44g55a0dsm/xajezijezifipapasi.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/9101cd3a9d68578a04333aad331c3a71/zurifisepulijiwolag.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b0e798ff7---78775322821.pdfIn PDF document text
    • https://medtek.vn/storage/file/76167049821.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/68458223598.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/tibidapojunenotopevi.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/nazikukaru.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/hvrp2t9r0feka4j580vtpmie23/sigeb.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/0990d5e863cf662eacfdcf695e6e065f/99455890904.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/2460916641.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/3ad285367e5429a0aa8f154ed53a1797/17151831736.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/sonevamegovisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=members+only+vol+4+album+downloadPDF link annotation
    • 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_off0000e3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B4 10796 bytes
SHA-256: e656d4de98e8ae0b80985c8904ebfe7264c1d271a6b6887837016bbaf0f1b850
font_01_sfnt_off0000fca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA3 17980 bytes
SHA-256: d20f54ae1f185748ab7da6e59acb4249a9215a6267a462232cfff73a68573168
font_02_sfnt_off00012b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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