Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5558d68396d155f…

MALICIOUS

PDF

83.4 KB Created: 2021-08-20 12:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8ca739fbdc96359e78561111cae084df SHA-1: 82f92d97c79aeaa5a20974ee3cdb3904615a3ca5 SHA-256: d5558d68396d155fb70697399fc97a8be221b970bc1cf3af1e7313eee6d9d525
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • 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 http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098366111fa2---59212054115.pdf In PDF document text
    • https://likeevent.it/writable/public/userfiles/file/xajomiw.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/rusejigo.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/24724757537.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/66fca55a993b01c0d1de1bdfa697f2d3/zerivadarazeluwefajud.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f4abb9095---zinavukigawezulapewimu.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/86986965357.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/19070730295.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/93406006987.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f5a319b9945---roxukadolubor.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/30417817893.pdfIn PDF document text
    • http://centromp.it/userfiles/files/gosor.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/kuforajifu.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/wusunisuvavafu.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210622_143154.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/0d03qratcbtliav5tn2pfk9br2/besosef.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/4911680379.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946f60e2df7---momubewilanikogu.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16074c57a287db---74026807300.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/kigamulaxinazitaji.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/1970465407.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/94997031700.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db9099228b7---63304932534.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/88257364569.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=beginners+guide+to+constructing+the+universe+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/71c41f67fc8249ca4f9ce3b38e1f1ed3/fiposezogak.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_off0000e0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B8 10912 bytes
SHA-256: bfd009a91f84c830b985b0a79a0bf661866e8f0cf706ae37feb0cd6fdebcfd3b
font_02_sfnt_off000111c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C2 16904 bytes
SHA-256: 8512c6917e500a933090af4e690721cc474751f23377f80d38ca9797a39ae2e0