Malicious PDF — malware analysis report

Static analysis result for SHA-256 8781a3f6244fa9c2…

MALICIOUS

PDF

90.4 KB Created: 2021-09-08 17:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: be3780a176eda770891dd29a70306225 SHA-1: 4192ae758e206277f492236dd97a73fe0d6b152f SHA-256: 8781a3f6244fa9c28b2ef693693e2b0d0ac2e1130671925a0407573632552e52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to lead users to phishing sites or download further malware, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=buku+adobe+premiere+pro+cc+2017+pdf PDF link annotation
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366c105641a---jidoritapaxarubefiboze.pdfIn PDF document text
    • https://hoalavender.net/upload/files/kurixobinusabakutopuniz.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/toeanqcleo3v9d4h7doq72vdj4/5515197161.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/riduvesi.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/83754979275.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210904142219.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/dimerijosew.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/tikib.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a3c714a82---61140535080.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/20267862245.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/fowogukagajax.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/95916845257.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/72056382499.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613008af17e0d---44896794522.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1ae219cda---72118775763.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/88191951166.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/widoxikujerifozopa.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/20921410658.pdfIn PDF document text
    • https://tigapilar.com/upload/files/2292330043.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16133acc8808bc---devovibejajese.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/d2ce55c0b1071c92a4a6ef77d561cb93/mozubepirejupetobitejewu.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/53034184584.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/51295820790.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135a7ca6d219---98986673074.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_off0000fb69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11380 11096 bytes
SHA-256: aa2888d470a71fd7248e365a7664eff82f96ea5c1cd92d218af79d4d4ca80f8a
font_02_sfnt_off00012d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D41 17796 bytes
SHA-256: ea161f7539853a859a901342650e51d1d7ad15a7bbd135e2dbcc0f6550a05334

Open this report in the interactive analyzer, or submit your own file for analysis.