Malicious PDF — malware analysis report

Static analysis result for SHA-256 94130bad047892ad…

MALICIOUS

PDF

84.1 KB Created: 2021-09-02 10:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 2afec3f0c3fe4e03ca1bcf3202587877 SHA-1: 6af909114ed7175c9763e5a9eb74ab735fec9498 SHA-256: 94130bad047892ad62f7788c1ffa68e55c634f43da9b04711ab6bca148fd28f3
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to WordPress sites utilizing the 'formcraft' plugin for file uploads, suggesting a link farm or SEO spamming operation. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution via these compromised sites. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c71409530a---papowilozogexelulini.pdf In PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/rizofubukutuvef.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160726030e1f05---sodaripasezenopig.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/uevglerd47prdkcdrk48jea6mt/kelojalesowozogunolawog.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16086226ebdc7d---majobazitave.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/65824759870.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/e22e07d9e71dc0838444e974a7aad34b/runesaji.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1612c4774cdfa0---ravutedep.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/furorapazozulalinezunemuj.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb0afaaf0d---wakibizo.pdfIn PDF document text
    • https://efnnma.org/files/file/74029574073.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c98b95093---tebaxiwizakeza.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/wepagezejugerex.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/tefivazigasoga.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210712_14D9542970B8DC39.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/16206124586.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/luvepitasavikole.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/87496927218.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/67082937282.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/2335021911.pdfIn PDF document text
    • https://phuquiland.com/upload/files/vaxajexunemekib.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/vizetejafukuru.pdfIn PDF document text
    • http://abworder.com/uploads/files/todofa.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/57937164769.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=future+continuous+tense+worksheet+for+class+5PDF 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_off0000dd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9F 10820 bytes
SHA-256: 75c7bad02c7c39fc01aeaed9fcf0bc5e7e5e523370164fb8f09c63a8653e60a4
font_01_sfnt_off0000f6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A2 19000 bytes
SHA-256: a58d998e5a4adc8e142f7f26e57bcac9d938a79b721cdef09a9248bccfd8f347
font_02_sfnt_off0001272e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1