Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f3487af08fbcda…

MALICIOUS

PDF

84.1 KB Created: 2021-08-30 16:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0187b2ffb05d6791294e371e6fd9e9a9 SHA-1: a3f0d0ce851475c627abaa303d7505e46ccb6c34 SHA-256: d4f3487af08fbcdab38e3ca3fdba4895493b07c8f61581d6c1fae4e6f9de0034
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external links, many pointing to compromised or disposable domains, suggesting it functions as a link farm to lure users to malicious sites. The presence of numerous external URIs and link farm indicators strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://nanobubblevietnam.com/uploads/userfiles/file/68592566648.pdf In PDF document text
    • https://citytrafik.nu/images/file/porokirujafakibovolet.pdfIn PDF document text
    • https://razredna-nastava.net/files/21970590724.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/85825554414.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/9uban22if0uu3344r1jupuln1n/63581121012.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/51315588942.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/2276378690.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/87919593584.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/xoteliwar.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/59c597d1653c79c1729f4bbd00119698/58201572281.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607d69e40a10a---vumur.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/c48693eab2b2da6b4549ec7333cd9928/pegudorir.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc18e01284---joselixepiruseki.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/papoziwupikafazogasuk.pdfIn PDF document text
    • http://industra.sk/userfiles/file/jobuneketaruvobusu.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1713a3411a---62504925784.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/69421368364.pdfIn PDF document text
    • http://hphs1958reunion.com/clients/47465/File/21200897026.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/51272936800.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/9920935963.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/62946142853.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/41341399041.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/bk399ipd2ut5ja2o4n0tjsn6e4/valamuga.pdfIn PDF document text
    • http://imaginove.eu/data/Files/savun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=can+a+16+year+old+driver+have+passengers+in+texasPDF 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_off0000e193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE193 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AA 11204 bytes
SHA-256: db7035d2e69dd9754005214fa7623bcec3449cd65f65bf98f596a2350a2f16cb
font_02_sfnt_off000113be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BE 17616 bytes
SHA-256: aaf2f3772541404d90509ab695c3524939dbf16c3fb428738564eda459cdd600