Malicious PDF — malware analysis report

Static analysis result for SHA-256 817f71b61aa9206f…

MALICIOUS

PDF

86.0 KB Created: 2021-07-07 10:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9dce59976f067ac49fb57c355d480b72 SHA-1: df50138223b204044b2faae2e5680d9218eba425 SHA-256: 817f71b61aa9206f4fa63ce282b5248c3e278730d50a4013b5d6a5ebc31f6b36
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to compromised or malicious websites. The presence of multiple distinct hosts and UTM parameters further supports the link farm attack pattern, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://crysiq.ru/uplcv?utm_term=john+fogerty+fortunate+son+live
    • http://cecev.com/stockages/files/lolosekerojawukedime.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac99eb2631---73347534371.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/6976b9df6ebe199fa69305945ed61308/lamoxajefu.pdf
    • http://daydala.com/userfiles/file/mizuletosuzimipogito.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/dhiqt2t3rmra7ct8rro9cce451/jobifibudisiwabokabuwifu.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/t1jtdgcnlb3d1vbcltcrhopsa4/nuwonani.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/25b0cb5798fff9c4750d093ab66751a7/tipaxulanikadufiru.pdf
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/40424714252.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/896a6ecae26b32ca9dbed8c4dd5b77f7/levozumusegowifokikotuj.pdf
    • https://abofahed.com/userfiles/file/70168475051.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f70a21663b---23636268555.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/9drge0g9op82h1q4nsichp65qf/11616771490.pdf
    • http://cowmoo.org/ckfinder/userfiles/files/49390200371.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c260d8e3e0d---dejevojokusejukap.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/96ekjg5loh75v5k79cl7ka6dvi/xadodoliwirebe.pdf
    • http://ledseoul.com/userData/board/file/riraruzalesudugi.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c926573e4b8---mowejok.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/f0f0f7b5aaa26a51a7420e199ada3397/57661362483.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/4b31e38ce6983fa5318cd8158e95dc9e/59123050333.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a874e8f047---lolaxaganusumuvesekakufem.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/rjakb1qrt9vd9usdhmrunhb7vr/23037939968.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/517baqbs0suhndlo0q030n4meh/63436991939.pdf
    • http://domeinbeverdonk.be/assets/files/file/54638632803.pdf
    • 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_off0000ed33.bin
ba34577a30142d7e2d6e03005e1bee324f8d8b90e0f504000856d9fb7d919a1a
pdf-font-stream PDF embedded font (sfnt) at offset 0xED33 10764 bytes
font_01_sfnt_off000105fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105FB 16792 bytes
font_02_sfnt_off00011e0d.bin
dbe4f6c32a9b1886fea3cf214588afc34327edd37acb817a7148cb97b5d6e096
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0D 17296 bytes