Malicious PDF — malware analysis report

Static analysis result for SHA-256 76de182b89bba8af…

MALICIOUS

PDF

81.8 KB Created: 2021-09-21 03:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0e57cab2754947c9220c95f8d2fd45ed SHA-1: 36b66b118df4c1fc0945a61a74f84239cfb69bac SHA-256: 76de182b89bba8af97113d7d6fdb8acce1d8f098ddf856b2aa10a8bd72dfc7a4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery via these links. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://wastran.ru/uplcv?utm_term=how+to+find+my+android+device+id PDF link annotation
    • http://pasaru.com/upload/files/zalatogivubolotag.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/29254893304.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/67248513779.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/72280779865.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/rexetikufejowufenimiki.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/69a088f593c69fedd3078a594d0b4620/47240173496.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210901051426.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/12984165335.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/zigozezovagoxam.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/21982602607.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161439f71f3aad---68809290389.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/milalexazasa.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/19544747170.pdfIn PDF document text
    • http://movediary.com/userfiles/file/76231727528.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/memusojesonuzotulawi.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/26866987713.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/73386075256.pdfIn PDF document text
    • https://tonitomov.com/picture/file/59231628993.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/bameninelubuxezifavojo.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/65730abce640d2fcd55c9bd910f846d1/20313526267.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/96087628494.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/60283623160.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/28224845974.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/66590573501.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/99968677759.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://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_off0000de4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4B 10680 bytes
SHA-256: 8c7c798b9b0723645ba1706a21ca53d67dc7fa66bc4a7a78e073c625128e1684
font_01_sfnt_off0000f6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C4 17764 bytes
SHA-256: 02c64996be9b0c4d572bf80dbc07eb396f777d5949ef7c120b04a4dea8e37252
font_02_sfnt_off0001250e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1