Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f6128000f3d4c44…

MALICIOUS

PDF

74.0 KB Created: 2021-09-20 22:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ff4c7bb270381d15f52ec8636459d94d SHA-1: 0b9571f0d9526c2b13e1ef9ae49bf93af2881b7a SHA-256: 5f6128000f3d4c447ff2fd8f4e6fbf4701748432b4ba72369f83a4f651225bd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to potentially compromised hosting or disposable domains. The ML classifier and ClamAV also identified it as malicious. The presence of numerous external URIs, including one with a 'utm_term' parameter suggesting tracking, indicates an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=gta+sa+lite+highly+compressed+android PDF link annotation
    • http://neboskreb-irk.ru/uploads/userfiles/files/43265389752.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/jowesipisida.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/2a927083f97f3e9c8a4ceaac863931c8/lowijekopugetiwiz.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/53179046093.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/70541637634.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/30682574168.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/dimesizutuvame.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/47660307915.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/gejim.pdfIn PDF document text
    • http://maxbrio.kr/files/files/katiriji.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/43581290049.pdfIn PDF document text
    • http://newmob.it/userfiles/files/72044000486.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/58360735363.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/lupuruzumofex.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/1189790717.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/68336723087.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148bb371c3cf---jalipudenisavinadazoxa.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/1450906663.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/34768203776.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/lefala.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/69018444920.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/29585286672.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/futog.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/0e85012d6730fce5b25e3a993f8c09f8/84032828648.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_off0000ba83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29A 11112 bytes
SHA-256: d98b1426a160becbbdddacdc0e6a058faf996f73011b3bfa411e4ba6a357caaf
font_02_sfnt_off0000ec2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2D 17876 bytes
SHA-256: 04eda119f38b501e911b422af272a890484fab1d21c11121708b1ef78582b4b1