Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ee8a575377605b…

MALICIOUS

PDF

89.5 KB Created: 2021-08-25 01:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 32e150dafa86b3591220e863207ae27c SHA-1: 2c771d8ec304e0b3f6b50ae6e059f677b2b73fa7 SHA-256: 31ee8a575377605bc5a8bb90ad1d540e72af687342fa19f5bf0a03e7dd2e11b1
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple domains, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://soudurelauziere.com/upload/editor/file/55060527839.pdf In PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/33334204806.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/13680553708.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e7ea76195c9---14241839458.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16082a772c16da---62815709136.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/59809560496.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/riromebebefowenipi.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/70d50047ac2de9b36309c3d1ea595e81/87130051027.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/47448888811.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/togitixuwosixa.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d95e652ddc---21421396735.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df2a1918426---24095638061.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/wofaxupalotozomovurabeda.pdfIn PDF document text
    • http://russia-ex.com/jevapokonivogulajo.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/kuravina.pdfIn PDF document text
    • http://allycatering.com/userfiles/furupa.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/442f03c40335ee27ce18208094b9afa8/zavizijemo.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/65305157257.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/vejomebutijirabozazexe.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/mebakesigejimajoz.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/wuwegis.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/lukinefu.pdfIn PDF document text
    • http://betaempire.com/uploads/userfiles/file/file/bexagepevedimaxobebofemur.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/badigapab.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/598678fd34f31204c45935dfeb340c31/xaxogurorofala.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/ziguxok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=best+recommendation+letter+examplesPDF 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_off0000fc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC02 10828 bytes
SHA-256: 674a58010cdfebd545313d1083d8ca2826f33a599a5ffd68a5e9d7928c7b61c4
font_01_sfnt_off00011509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11509 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1B 16504 bytes
SHA-256: 663851582f1b794177f17cd9602f99b8cbeb2de16587eb09933a79e4f3390bc3