Malicious PDF — malware analysis report

Static analysis result for SHA-256 2319f2a8be84af32…

MALICIOUS

PDF

76.4 KB Created: 2021-08-08 00:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fd515b35a4bf9ff7ea3d33414f0a7717 SHA-1: 97ca9206cd7a3d17ca9871f8a3624a233b092f2d SHA-256: 2319f2a8be84af32add763b036ada7af8c28c31f7bbd12cb67e69ccdd888b50e
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to manipulate search engine rankings or redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs, including those on compromised CMS uploads, supports this assessment. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific user interaction lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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://civilkontroll.hu/uploads/file/zubotepefonexazineg.pdf In PDF document text
    • https://robert-zauer.cz/userfiles/file/7285438858.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160996e091e10b---lugulafovokolemuke.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0ad024701---64104766557.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/38034ca6b84e7edc5fd845c8013190e0/pukisupijafesufuluxave.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/mikowupitumixejetovufabo.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/fdo7alun57spi5l3m06qjbtviu/55089440736.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/08754a49848c5f3473aae2503133c012/konanam.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ddb8bfeea---88596380282.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/cnlh9plrqrs71errvje53c2rmm/mavigujere.pdfIn PDF document text
    • http://www.centralperdana.com/file/94267927007.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/18318405834.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3dfe01038---62882622568.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c95982186---pedurev.pdfIn PDF document text
    • https://chp-travel.ir/data/file/80569974435.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d619f11f3e0---26405106154.pdfIn PDF document text
    • http://yilip.net/userData/board/file/zumatozifapodijawanawugad.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/2t3qa29nrnd5c6o1ujkppr6et1/sutikoxevomidupex.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608154439bee6---funeravuzasu.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/33aed3d649e76355e4fc1cead267310a/podifogodufisikajuxomizi.pdfIn PDF document text
    • https://cecprint.com/images/file/75745976318.pdfIn PDF document text
    • https://realschoolspirit.net/scauserfiles/files/zetotirumajonokewabe.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/sijaxad.pdfIn PDF document text
    • http://jucal.es/images/file/79500628565.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825392e3eea---kaxaneguwisub.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/50244619558.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=where+to+send+my+i+131+formPDF 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_off0000c96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE180 16360 bytes
SHA-256: 1ba877fd14556444225719a715cef070911d01777a64c4ec4999fbc61e40559c
font_02_sfnt_off00010bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDA 10740 bytes
SHA-256: 77b9e071e4b952ccc031ae65d991c077b34a896352696e9e87261db28b8d7773

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