Malicious PDF — malware analysis report

Static analysis result for SHA-256 49a1abd45fcbf829…

MALICIOUS

PDF

75.2 KB Created: 2021-08-11 02:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 98891ca3f8f4fd7bfef9b78587eb9c8a SHA-1: d20e9628825a31df81a4f431c9ec16ba032c9b11 SHA-256: 49a1abd45fcbf82946b8a97ad7bdce7637e28dd3ddbb047e8a2b0d9ccd7a09c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites, many of which appear to be hosted on disposable domains or utilize compromised CMS uploads. The presence of external URIs and link farms suggests an attempt to redirect users to phishing or malware-hosting sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://oniceh.ru/uplcv?utm_term=how+to+calculate+magnification+a+level+biology PDF link annotation
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/rlbu5fg1cc81qt7ota6568ark3/wazebixemonipuzuxiz.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/rawata.pdfIn PDF document text
    • http://beachhigh65.com/clients/879402/File/nexigubeseneledeziji.pdfIn PDF document text
    • https://autoskola-scp.com/files/3710427454.pdfIn PDF document text
    • https://lusagroup.mobi/images/website/user/files/luzupuzux.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/ae67dd23af0ee15e03f41f53cb957def/ferutikinasujorikerozesat.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/e0fafeb4947a7ee834e2124f5c9b0ee4/setelugutubelutasi.pdfIn PDF document text
    • http://betaempire.com/uploads/userfiles/file/file/sesaravadasemab.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/jkbuh61ieus06s1e18jq9am6e5/jesobababuzidejezax.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6e4c24d588---80580102433.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/baxofulivo.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba86933dce---35539246360.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/upu49o5a6qjkumchb2n3lrjh77/8652998950.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/49eef71ef79389ab26003d6f65c2adcf/vidizofagoxapisinuto.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4494d031a---10629007327.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/05e4rpil094mfgpnheojvmpnl9/24175472821.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/nureburomitibobegedekum.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/d57048dc9d25296a012a5c70187b9c17/41853758001.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/fccd1f9585318c02abb9da973e88e8fe/nupikofinexa.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c71fbfb22---jifosodubirobedisu.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a3c3cbfa20554571fc30b165fb5a33c5/litabupeba.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/7goqiqjnts8adhdgaubrusm6fk/tegomijatebol.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_off0000c397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC397 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA9 16176 bytes
SHA-256: 9f36e5230007d46c2b23e20882df69b0b611e47f1963dbb240596fb53007e381
font_02_sfnt_off00010594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10594 10908 bytes
SHA-256: 78ea56095e0c59477c7c3123d5a129557bc3e58a79ea9b27f74c9d1d77040d4e

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