Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8159dd3a0561843…

MALICIOUS

PDF

82.1 KB Created: 2021-09-07 03:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f5f178f264c264f25e57b0b65092d243 SHA-1: 5803d0a1a08fc380384f9cbc21bca8fe47212db4 SHA-256: d8159dd3a0561843fec1bbfb6f0282b376d712dee3441a82a44d09574ee0e525
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be compromised or disposable hosting. The critical heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document instructs the user to copy and paste content into a command-line interface, a common tactic for executing downloaded payloads. The ML classifier and ClamAV detection further support its malicious nature, suggesting it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://www.allatpatikapecs.hu/images/file/pesifenorefuw.pdf In PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/dovin.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/32949856435.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/beluzazejawo.pdfIn PDF document text
    • http://abwessex.com/uploads/files/moruxejukarotisokora.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/77288758937.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/d94168242a12b6d3a1a4b3467667f046/63814374040.pdfIn PDF document text
    • http://congtydaihai.com/upload/files/kurome.pdfIn PDF document text
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/11723243258.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/78dace53f139008ca08c06f9936adc62/jomodexapal.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/baxitigupapusu.pdfIn PDF document text
    • https://btegypt.com/file/76161245054.pdfIn PDF document text
    • http://alcantara.cz/data/file/buzumidagux.pdfIn PDF document text
    • http://airmon.hu/images/files/fiximutolirowatakobux.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608538370e1b8---gitesibazej.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/56565287260.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ae534a0ab021d72924efaa6f988974cd/varazenemexorevo.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/dusobawijerixekexukosata.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/wuzufefudopowumopiwapoxo.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/64494569890.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/dipigigapikipubumevojojif.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/9u59ohpqe4lcjq68rhjtq4io94/nuwof.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user///file/_0219522001627197553.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078529966a60---bivuxabu.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/72528201391.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=tutorial+cordova+indonesia+pdfPDF link annotation
    • 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_off0000da83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA83 10744 bytes
SHA-256: 0d5f43552af589518032f1fa4b600df27fff360063db4188c912d98425b1308b
font_01_sfnt_off0000f359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF359 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6B 17992 bytes
SHA-256: c1249cd3ed615cde56a9d9e153cca5c46c421af500150b3fde58a06b5bf83a78

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