Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa50a498b9a7b557…

MALICIOUS

PDF

75.6 KB Created: 2021-09-11 22:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6d83d571d316e419edb3488809b39d53 SHA-1: ba888bec42d4c0c71478ffc14bdd32fe96525417 SHA-256: aa50a498b9a7b557936a56a0a6c2e933f326b4cdcd54c8bdd7350f9c1dbde5c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to various domains, some of which are hosted on compromised CMS upload storage or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using numerous distinct, low-link-count hosts, often with UTM parameters, which is common in phishing and spam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://thegioioto.store/upload/files/84402103264.pdf In PDF document text
    • http://ipceurope.eu/assets/file/38348575118.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/bubute.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/fojoladezida.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137a1792b9a7---fanokugeworifazin.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613821884a1ba---79615676789.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/40152778625.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/momeserezametiguwoz.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/mupum.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/fabisiwixadegalalipava.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/aeb47520395b951fdb2f2aa58ac9bc34/rakexuwijir.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/bc8b6a1c3e5406daddc9b904cbf9dfbb/80071348708.pdfIn PDF document text
    • http://xfswchem.com/upload/files/22955064151.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/48228945537.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/52251842170.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/77433432869.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/kugoxopexixinavutitokataz.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/topajajopozovamel.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/wigovafomuzunezuligep.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/59255508312.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/93450000639.pdfIn PDF document text
    • http://sieuthibds.net/images/files/84386569073.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=pokemon+mod+iosPDF 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_off0000c30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC30B 10096 bytes
SHA-256: fdf3fdfbfbfb9f9ea6e5b5964e31aafb4d8df74324afe0bb45d6bef1af073f17
font_01_sfnt_off0000d985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD985 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF197 18572 bytes
SHA-256: b8ce170c4ed60da90ebd511cc39b54ed2ae10feb69626848b0921687f776ad02