Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a6e878f008fc38…

MALICIOUS

PDF

83.8 KB Created: 2021-08-03 03:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec8d9cd04015085846c3861c5c7c69b8 SHA-1: 4358f26f2eb76d6fdb410f9ce1629e36163e89f9 SHA-256: a4a6e878f008fc388420b5c6192843f1fd08a43f6102650476aa3f537cb1ab1b
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URIs and link farms strongly suggests an attempt to redirect the user to a malicious site, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/9fd40cc47d5b53bf012d6174506fe161/44798027928.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/b5aba9159c665d73c07d687b8ae63a13/38751939253.pdf
    • http://panziofabian.hu/fck_kepek/tokawikokojelusubo.pdf
    • http://korea-seals.com/ckfinder/userfiles/files/lajujifuvebogewonome.pdf
    • http://gianphoiduyloimodel.com/Images_upload/files/banowabupafasefax.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c27d201e3---kulonudinezadakebifisad.pdf
    • https://tomorrowhubs.com/upload/users/files/67724226010.pdf
    • https://tort-art.ru/userfiles/file/22172311651.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160db2a6d625bf---depujofosedizedipaloxa.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d89f7055c8---12854226066.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/1252328f5ae298afcd5ef87c28dabe11/niwuzivelodejezomoporipe.pdf
    • https://aronabritcan.com/userfiles/file/6959643893.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b2e15f8d7---vudamojopuderafokapox.pdf
    • https://marosme.ro/hirek/file/lemimubavinabazeziv.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba222eb1fd9---wiwujatog.pdf
    • http://www.bash.cl/media/file/80587925744.pdf
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/patanewudik.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b17e7ea45---18279498646.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/plcqiv1ijjgj804dmql8pcfag4/salalulodimir.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/d915f446904908fc9e274f2f7e9f3841/95014840719.pdf
    • https://dentalrud.com/userfiles/file/nixijanoxuto.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a436ea1af06---gowofawus.pdf
    • http://ampletrekking.com/userfiles/file/fovulurogupevejapeti.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=esp+hack+pubg+mobile+apk+download+2021
    • 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_off0000e14e.bin
b31a49f0f4db11ff8ce289aeddcaa4d118c83fcfeca690cd829a325b06e3db63
pdf-font-stream PDF embedded font (sfnt) at offset 0xE14E 11456 bytes
font_01_sfnt_off0000fbe4.bin
0e77c05cbe7a80dee07152e3f81f396fd39f2db44195ac48ce4888acc0a16446
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE4 16608 bytes
font_02_sfnt_off00012718.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12718 16792 bytes