Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2f9b5144718d592…

MALICIOUS

PDF

87.3 KB Created: 2021-09-12 12:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e3756a1140476d640063710a2e18ac20 SHA-1: 68b30f24931c87287dee0267cdb9ea608072ca0f SHA-256: c2f9b5144718d5922b6bb603017cd466dabfeb05218dc07cd8ccb1b67dd77efb
176 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan-like behavior. It contains a link farm with numerous URLs, some hosted on compromised CMS uploads, suggesting an attempt to redirect users to malicious sites. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support the attack pattern of luring users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://demkapi.com/resimler/files/54910857678.pdf In PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137b55808df6---sadone.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/90939344115.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/rovaperinodagadi.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/runez.pdfIn PDF document text
    • http://wernitznigg.at/files/direfaxojakunimitokoxadig.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/noroga.pdfIn PDF document text
    • http://dztechfin.com/upload/file///91140115187.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b53b44bfe2---kikaremotojudopum.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1a4345a64---9733602404.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/12373331712.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/jarorezubegidi.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/32211243543.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc3619cfd0---605630072.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///12787097517.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/61570694373.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/91614923483.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/1123954869613c14653645d.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/13081372300.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/zulugunozo.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/ziredikovubenale.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/welipaf.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/rarigavaraworutev.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/70973030742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=chal+mera+putt+2+full+movie+online+gomoviesPDF 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_off0000e779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE779 20180 bytes
SHA-256: 52a3ffec68e2628a6282c35f3ba13d3baee01dbb9434fd6d9cbda169b09dc260
font_01_sfnt_off00011db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C7 11124 bytes
SHA-256: 33e39882a7a5cd06643f239f28251e5426739d941b7c640c71c1131eda9c8e8b

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