Malicious PDF — malware analysis report

Static analysis result for SHA-256 570138b387e84a20…

MALICIOUS

PDF

102.1 KB Created: 2021-08-13 16:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 633487d6c8323f9a667178689ce566fa SHA-1: f44da68ad97789f71ae2308935212bf8232c36fd SHA-256: 570138b387e84a205aca49eb9165b6e6638c9a993843da6590ab15ae128aae34
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable domains. This suggests the document's primary purpose is to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://argumentua.com/i/file/23119126542.pdf
    • http://blackshirts1960.com/clients/876325/File/tupurepojegonuxatova.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/d44fa3b79865d400b632dce6fa1fe8cf/gejifusafagunisobovikewa.pdf
    • http://www.macrolepidoptera.hu/userfiles/files/fitugowajobodovobelelira.pdf
    • http://studiotecnicoforace.eu/userfiles/files/nadikibobosunutun.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a0529e8b58a---silizutizupijapajax.pdf
    • https://exlite.it/ckfinder/userfiles/files/sevuz.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/u251inqqqa3lgha0vi5burvntd/96215230086.pdf
    • http://amctop.com/board_data/editor_img/file/202106300202.pdf
    • http://kvbm.org/pds/userfiles/files/lewijufo.pdf
    • https://grandplaza.bg/uploads/assets/file/buvuraxotosofetomuwobudu.pdf
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/bomanujalade.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc8cc804fa---wunuvozomejovapoxoze.pdf
    • http://dfwsedan.com/nbloom/fckuploads/file/direziwotuba.pdf
    • http://allnatureint.com/userfiles/file/rokijisomanobanasixatuzus.pdf
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce17f7c968---mavakojinakixufixisupu.pdf
    • http://jhdljz.com/userfiles/file/1627367911.pdf
    • http://ltmetal.com/userfiles/files/24176984788.pdf
    • http://saltokisport.com/uploads/files/76870163604.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad43a2c2665---rowit.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/31e90cffa3b5ce42fe51f0e9758eedd4/85891253394.pdf
    • http://icltindia.in/userfiles/file/bizidiratidokelunafekedag.pdf
    • http://boothbayharborshipyard.com/userfiles/file/gasijegepikujukaju.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=mandalas+de+animales+para+colorear+e+imprimir+pdf
    • 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_off000128b7.bin
2e682ee02beeca77fe16ce4fd477d4282f8d421ca979afb8b48bc4bf569fc8d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x128B7 10676 bytes
font_01_sfnt_off00014107.bin
ff71d3b4f41667d6e12c72a16d5619b7ba5b6be814f53b3c7df441bfec31ca4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x14107 18296 bytes
font_02_sfnt_off00016f28.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16F28 16792 bytes