Malicious PDF — malware analysis report

Static analysis result for SHA-256 e064aa02ceba5f24…

MALICIOUS

PDF

78.0 KB Created: 2021-09-23 01:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b4d17e758500e4cda32534be0c5c2357 SHA-1: b1a4d19a344b67f94ffcf40e3395f71eaa115612 SHA-256: e064aa02ceba5f243cbbae1f28985b46eb30bc7631532c927e928129cbd83656
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggest a phishing or malware distribution scheme. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a lure to download further payloads or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://nomylo.ru/uplcv?utm_term=how+to+draw+a+goat PDF link annotation
    • https://my-natural-style.net/upload/files/futawugifaw.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/86087369093.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/74559607597.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/47164845120.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134dc27d527e---sixetimimamaki.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/86607621365.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/roxixik.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/8772349411.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41034968417.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/kukar.pdfIn PDF document text
    • https://ijp2.com/contents/files/19745312332.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/39123853422.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/4766903851.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/586355667.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/jenoruvononogemoxunemet.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161410c3aadc98---47544546557.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b5ba7dcf0---duwususosuko.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/69154135574.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/19463188127.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/82137626826.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/86460539195.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/50365573805.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/26614566389.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_off0000d269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD269 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7F 9960 bytes
SHA-256: fc0085a2482398a737fc6029f7e17fd2484c5ce7e633bb6539f23aedb36b1def
font_02_sfnt_off00010068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10068 16368 bytes
SHA-256: d82eca5ef3c58cd6583567278bd58577269108b3b2c52aa7ba6f4afc23d01419

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