Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b939e3d60e93be8…

MALICIOUS

PDF

90.1 KB Created: 2021-08-03 13:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: de39d6bc69af2a6bc17fe3d18c32fd1f SHA-1: 3fa4b983987d64e76f1ca7b45104caef97cc717c SHA-256: 1b939e3d60e93be8fa61ced1b270ac763543a1d9f645d59f6f1badc480259878
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://drafthe.ru/uplcv?utm_term=why+is+non+diegetic+sound+important PDF link annotation
    • https://electroagro.es/pub/files/sozemefilikeviloke.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/gemigo.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c2f64e44a---16106820770.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/fulewozopimedulejivifiluk.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/4c9f972241aa8c3f6197dd62f4d6bf36/jatirulevurogifesugid.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/miropuvitokomifel.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/wefeduwemilirazadabijupo.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/44820058259.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/4419tu0lg5m4ce8tn4n23o16h0/74055331983.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/68142193793.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/667d1ca6ec0704bc2989125c2ecee149/dirorotasi.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/jaden.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f56fbdce9---xopufukatanimezin.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/72790141.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/45e338d172ff63b7bbf0b9e5e35c2503/87365359567.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/63677221959.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/80710303779.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/namivixem.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607513262a0e9---47275378691.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607280809def5---fuzin.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160801114c1a1d---fiwurirefituponodo.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/4190890951.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-7-4/20210704112141391520.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_off0000f878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF878 11120 bytes
SHA-256: a139953af9142186f3c8f26170b3aa094afe30a02c14e7a16447d5ea085e1815
font_01_sfnt_off00011210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11210 18300 bytes
SHA-256: fb2140ebf7bc38b048561bba679d7420539d3a8d0f3098f5c2a17b44aa8739fe
font_02_sfnt_off0001421d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1421D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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