Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e05f16d84665d46…

MALICIOUS

PDF

86.3 KB Created: 2021-09-18 00:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7273d6a84023bb9694f91a3df3ca4c27 SHA-1: 6cbd3b10af262848b24cbd4336c1122b3e2bffc1 SHA-256: 7e05f16d84665d46bbf4826945c8e81f45af01d2f02b6ac1cb5b89f87864a90a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm and a callback phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing attack designed to trick users into initiating a phone call, likely for financial gain or credential harvesting.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://fairbank-ia.org/admin/ckfinder/userfiles/files/74882719183.pdf In PDF document text
    • http://studiolauramoschini.it/userfiles/files/xopefekebobudumuki.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/mewitasuziligowewamava.pdfIn PDF document text
    • http://eternaseguros.net/files/files/rebidejisedelerufi.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/fifetulajukimenetadexo.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/xipedafisum.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/sudikefiza.pdfIn PDF document text
    • https://inks.bg/userfiles/file/kizodesagokalozu.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161440ba4c0e2d---zaxekizuramakajupoliko.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/15137467909.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/193cab8a5fa6dbc9e97af81f3c2d914e/9637215592.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/47096453775.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/15915730010.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/67526229124.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/87007112292.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109120323395071.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/39650106055.pdfIn PDF document text
    • https://bela.geekers.tw/upload/file_folder/file/81710817736.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/remoputuwubunatikaso.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306c59e1d2a---taxazisajuxapepezu.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/49521438305.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/27105673888.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/xeragufiwebarafatipo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+hack+fb+account+in+android+phonePDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/fapil.pdfIn PDF document text
    • 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_off0000ea7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7E 18224 bytes
SHA-256: 9f6c7e7917f85958743e14d7d6ffc21abcd1b74ddadce31a82ca3fe75d8410b1
font_01_sfnt_off00011ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC4 10912 bytes
SHA-256: d279eb958b1f8c1ec12b3cc0e95369a22f3d48c0ce11dfd2eb4304a06ec2719f
font_02_sfnt_off000133c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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