Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0272afd427232fa…

MALICIOUS

PDF

75.8 KB Created: 2021-09-06 04:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 932fd0325029d68daa970c2881f5b932 SHA-1: d2266a7ae5fb75ec32a6dc54a2e834e715de7f51 SHA-256: f0272afd427232fa6ba406472ea87d4e67c4d87dd07486fafa5aa2088bf963ba
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it is a link farm on disposable hosting and potentially a callback phishing lure. The embedded URLs, such as 'https://archism.ru/uplcv?utm_term=la+la+land+piano+sheet+free+pdf', likely serve as the primary mechanism for directing users to malicious content. No scripts were extracted, but the PDF structure and URL patterns suggest an attempt to exploit user interaction for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://archism.ru/uplcv?utm_term=la+la+land+piano+sheet+free+pdf PDF link annotation
    • http://dallapietamarchisio.it/userfiles/files/vasuwozufifut.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb1da8d810---tuxobagebatatajemegejuxuk.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/dokigemavabel.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/guduratexib.pdfIn PDF document text
    • https://www.lloydsunder30s.com/ckfinder/userfiles/files/16975103437.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f6555b39232b4b478b9119b20c256dc1/moforuxadodekurivaji.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1611bc48fd8447---bawijodupasomubigizut.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/fiwegef.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cfdd518cb1e---nipezibatozorilo.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/44916538456.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/gekujetugexiva.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/9tv3gksjb4120rgdbh715adrb0/wogoxofijesiridab.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/zugovubidimufed.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/vifabelukesip.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/pugepida.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160941255f1bab---38856973416.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e09fc652e67---16107690454.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076434b26765---2018417259.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/baf373008e1d7ff9c17ac543325be41a/19684323998.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/lekevorivej.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/24056242904.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/gedukagowijimopo.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/9b8f07787549b42426c0344989956190/girotu.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_off0000c310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC310 10552 bytes
SHA-256: 43e16910bf73e85d1100aeda71f190a3091735d9051f1c65220aff66ec2646ef
font_01_sfnt_off0000daf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF3 17932 bytes
SHA-256: 4b9819efc18d8f2a11a0f0b7ff5b17f2384e4bcf86597289aaf74964252d6cab
font_02_sfnt_off000109f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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