Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd0a904a8bdf94f8…

MALICIOUS

PDF

74.2 KB Created: 2021-09-25 06:36:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0bd615c6ce6bbf7d9891a22e36cb625e SHA-1: 8b144e2014eb1f5464184b90d3cfd150b05a1ccc SHA-256: fd0a904a8bdf94f87f9ffa5e3e04b905c26e501d6455fc2cedc6d2e378291192
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites hosting PDF files. The presence of a 'firestick os download' UTM term in one URL suggests a phishing or malware distribution lure. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4d7ac56d3---72606857841.pdf In PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/p9mjajik1631dp5d9l534ckufg/50258213463.pdfIn PDF document text
    • https://terrebleue.org/userfiles/file/13560463009.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16143c01253c98---ponesedusum.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/3c06421f1557231142db666d890f9142/26252808633.pdfIn PDF document text
    • https://pcetravel.com/files/file/xigefux.pdfIn PDF document text
    • http://autoescuelatosal.com/galeria/files/45798399865.pdfIn PDF document text
    • https://st-stephens-church.com/upload/File/vutexilat.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/38988875178.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210904035716.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/2063467832.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/gukawo.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/fbdb818682a95d2b9fb274f28e180812/10125760240.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///56877492707.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/79702114547.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/jajuvexegovito.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/92003827319.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/24627194541.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/94737375390.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16320436301356859195.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/61551628828.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/luxiwovemi.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/zukirupajepije.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=firestick+os+downloadPDF 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_off0000b8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A0 19232 bytes
SHA-256: ad27fffd055d00a25185505e6899044cf358004e5a49ec738a828d76b2d58809
font_01_sfnt_off0000eb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0C 10520 bytes
SHA-256: 673f733c9dd1537c400bb12a03fbd10596b9c63f3662a00508b40d0dba74ac19
font_02_sfnt_off00010336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10336 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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