Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b2e22669c5deba…

MALICIOUS

PDF

116.3 KB Created: 2021-10-05 15:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4d88c02ab203df669afbc27fd8aafe91 SHA-1: d078061921ce7f509ae16c1359fb347a035f1b59 SHA-256: 88b2e22669c5deba4b303f3b1c4c5ba2408b6d640f0c91f9c664f92e3b3d1fa1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to lure users to malicious content or phishing pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further suggesting malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cdcd72b570---xugokabafib.pdf In PDF document text
    • https://apotekatia.ba/fajlovi/vafejowof.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/79416402352.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144dd0deca41---bimopasumelipe.pdfIn PDF document text
    • http://suaups.net/userfiles/file/kilijulelonaragalujive.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135e6ca02e0e---90398617292.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/mozaxatejan.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/paxituzol.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/dalis.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/voguwijegejidaruvujinix.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/fizojuwanokijivujepur.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d13bb12697---pojuro.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/uavscncc12cr8nvftrhtd1s6md/51036520085.pdfIn PDF document text
    • https://promoxcenter.ro/ckfinder/userfiles/files/tezefenovokowoxiwepapa.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/baligunataxerusegubisofax.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/98977281528.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/guzimebalokivaja.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/91347819381.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/sebanobi.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/6019593219.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210909_CB726834A240DE4E.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/kuzilika.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/majelusarepenukazokefuti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=jee+mains+physics+vector+questions+pdfPDF 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_off00015970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15970 11256 bytes
SHA-256: 496af9b7427e56a31ea8dcea1825d96d898857c7be408eaeafcca82ca2b79665
font_01_sfnt_off00017376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17376 21160 bytes
SHA-256: b44d27f191e3ec310939663765c6120cf9d318eb3f4de2b74aec5aa8c57a5a11
font_02_sfnt_off0001aac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AAC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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