Malicious PDF — malware analysis report

Static analysis result for SHA-256 97e457fbe1d22bf8…

MALICIOUS

PDF

82.0 KB Created: 2021-09-20 21:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6e0de06a62fd0aae8da393604d08095d SHA-1: 2ba4efcbc0f300e1bc6f7b2e82ce50e9512271d7 SHA-256: 97e457fbe1d22bf8c3b979841dc9af76715efaef38e9b637a911de482af16ea2
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://smidgel.ru/uplcv?utm_term=relativity+formula+sheet PDF link annotation
    • https://papiratisk.cz/soubory/17754398342.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/bijizitigoj.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/rekepibu.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/14918664278.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/24457548385.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/sajisibinure.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210902145021.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/42147881239.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/93335058266.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/190009377.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613520faeb90b---22940608770.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/21982974315.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/28511406354.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/31637548182.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/20110800448.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16141fa819e603---kuvolemazanamiremojimutas.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/tozefagowisesubetivakokix.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/98715090024.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/4716982245.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16140913c373ef---68209965443.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/kinorabemizuxufexav.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/20785822012.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/60944527883.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_off0000db88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB88 10700 bytes
SHA-256: f2c1495e730cba657193b2f7153e18edb6c540c4dcf406c72e43dcb3de341292
font_01_sfnt_off0000f422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF422 17856 bytes
SHA-256: a4e53a12120fb164fe833c326a35b11ecaaa2c4c4944ecfdf944629ea06b1fc8
font_02_sfnt_off0001227f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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