Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c59d9ef470064e…

MALICIOUS

PDF

86.0 KB Created: 2021-06-30 23:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b4a38c9b218a1a2d1cc2f88c3ff8d320 SHA-1: 801f65819ca5af44b4dcce27a55d5bf5ac39cf52 SHA-256: 82c59d9ef470064e775381e182aa00a098bd395e5a0386c1202d0d24f4861f2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The primary purpose appears to be redirecting users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://tavio.ru/files/file/giwuvujoxag.pdf
    • http://wangyiphk.com/userfiles/35795248077.pdf
    • http://driscollandgibson.com/images/edit_images/file/11410413226.pdf
    • https://nhachoxebus.com/upload/fck/file/lebovojimagegepoveri.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/53bb03b3d57ace0e55e4d2cce418808d/44074286490.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/bktd40lapcj7ikp0geg2ttqhqo/vusibakujinonutajokas.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/41dc0301fd5c3322f5810f103e9ec78a/pobotitudirunuvapusapaket.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/jrkd869g6g6ocvu6fp2ffl8is2/72851808500.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc908810812---wudixizufoj.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/35cdc7c09d3729a9be4475adac70b3f3/bamixaxuwofuzivorexeme.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/34p3b9v59btkl9rnkbhs72pc29/31069420241.pdf
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/61483940380.pdf
    • http://industrialdevices.in/uploads/xuforenukeginagudepakib.pdf
    • http://www.knickmeier.net/images/pageimg/file/82394710258.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad22b87003---fowefowedo.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/8bhtvvlum6acp5mtm9k7l08h2p/54010804176.pdf
    • http://curry-box-deluxe.de/userfiles/file/22299421408.pdf
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/gavumavekifajil.pdf
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/98598238838.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a89faeba25c---89823093030.pdf
    • http://teraval.cz/res/file/febawumu.pdf
    • http://tasarimak.net/ckfinder/userfiles/files/32519965026.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=a+healthy+balanced+diet+can+help+provide
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee79.bin
a482db1d648cb571668eaad6580137d0774848a1994751b34799be7fcf6c3b33
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE79 16304 bytes
font_01_sfnt_off000118b2.bin
f7de8879aaeb25dee45d433537041300ef331321e6f78df5fc10cc2e097edb62
pdf-font-stream PDF embedded font (sfnt) at offset 0x118B2 10744 bytes
font_02_sfnt_off00013128.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13128 16792 bytes