Malicious PDF — malware analysis report

Static analysis result for SHA-256 026dfdc4521a09bb…

MALICIOUS

PDF

83.5 KB Created: 2021-07-19 19:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ddbf8556f0a71c78808c0b89d4fe821a SHA-1: b775480526a7c6cb94b2c295592f7084ea8687e9 SHA-256: 026dfdc4521a09bb127f5012ae09056bde41d3326c3a84d7652948b002c53322
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 link farm pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to download further malicious content. The presence of embedded URLs and the nature of the heuristics suggest an attempt to trick users into downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c75839155---wijurubobi.pdf In PDF document text
    • http://collegium-connect.nl/ckupload/files/24108177180.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62cfa271b8---lixukagagetuna.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/80e59d9b75b42cff4d0c45f65677762b/30981763221.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/mufenevipawedusilexupika.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/noxanidamejas.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/tijumodusolupurezonaw.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/32662638590.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/2cagiqeevt6se4bkud1j3ih5fv/zururironilutizowerig.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/cd1acnu35tl5mlf5jhv3pfpfe6/gefutogorigoganunatufu.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/42980032624.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/4755081979.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/750677f7d8a5ce48c628f07162d08f1d/tokomidifazolezor.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/78185431757.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/govanor.pdfIn PDF document text
    • http://skupka23.ru/upload/m/1957125389.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072842a9de02---naboratijiladuket.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ae084f835---fowalitomivonesifeleb.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/37978720419.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/gcnkmsgerdh5vj865r3idgbv53/50101978577.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca9d951f9e---febemov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=fcr+tunnel+syndromePDF 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_off0000e3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B2 17472 bytes
SHA-256: 6c888e22a914ccc8f5979c94be77fb65ffef080327f1ccb8fa4d9b52ac4d8bcd
font_01_sfnt_off0001117e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117E 10468 bytes
SHA-256: 56bc99c456eb6c1440b28fd97947abb236a889ff6adb8d14065f259d64e6640f
font_02_sfnt_off00012957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12957 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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