Malicious PDF — malware analysis report

Static analysis result for SHA-256 285fbddc196220eb…

MALICIOUS

PDF

100.0 KB Created: 2021-07-02 07:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 17529b491250b7309fdc096d402d239e SHA-1: 12a8b4eb90f79c71a48e4381e44c6c032c8aca0b SHA-256: 285fbddc196220eb0a4ad0ecc6b533a9c12f82dce7b163433bb0121699810b09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the nature of the URLs and the detection names imply a malicious intent to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a768444fd---35344773106.pdf In PDF document text
    • http://lucavolpicella.it/userfiles/files/65476666593.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/31848914804.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/2fa5b4d2a4b1a5380947423c56830569/80951043734.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d70a3c9cac7---linamotitivazerurimuguli.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a1ed1060e---kizuviwupaxusu.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c1a03c3cc---13405441840.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097da3f868dd---nogixalutaferekiwoparunu.pdfIn PDF document text
    • https://bdcomunicazione.it/file/puxikaxodipubafudovixe.pdfIn PDF document text
    • http://centrons.com/uploaded/file/37770611660b48ab77a9b6.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/lufuw.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/nosusapajuketixufelez.pdfIn PDF document text
    • http://healthywithhart.com/res/file/vavusemaluximoxewedu.pdfIn PDF document text
    • https://botorka.ro/userfiles/file/27157438577.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/mawapuxovatuzam.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4bf549071---81470348096.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/1415008007.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/91570102896.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/2d1f654c9f64f7067d3773f87edf3b12/85667526595.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a92ae39806c---lefonimizivizupizabonunu.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3786e8dadd---12103604587.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/18105090865.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/98546d2b67258007cfed2e5007714771/varunepitonowelek.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/a901bcdd4fd8946d4aae36a0e0462672/xorubonufabatadudozipogad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=value+chain+analysis+is+a+means+toPDF 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_off00012509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12509 17460 bytes
SHA-256: 5a4b4073475a31b863b051ddd4f0a1c016d8843ab5a9b14211e2e3f5d96c5841
font_01_sfnt_off00015299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15299 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AB0 10580 bytes
SHA-256: 25239c3bac60151a5fdc90be3788d204487b34499f5439f77d2d95c448dde4ce