Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c844955ce66751a…

MALICIOUS

PDF

117.0 KB Created: 2021-08-03 09:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d507333d115b0e33fae2f8ab39f9438c SHA-1: e954ba8b6fea551a51e60c2fb40e09d75ba14fec SHA-256: 7c844955ce66751a99e7fd0c3aacf20243b1d7bd1885124e0b45befd43883e42
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress uploads or disposable hosting, indicating a link farm designed to lead users to malicious sites. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing or trojan delivery mechanism. The presence of multiple distinct hosts and UTM parameters suggests an attempt to obscure the final destination and potentially track user engagement with the lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://wastran.ru/uplcv?utm_term=fractional+partial+differential+equations+with+boundary+conditions PDF link annotation
    • http://alanurturizm.com/rsm/files/galowinuja.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/62131157353.pdfIn PDF document text
    • https://btegypt.com/file/65493069523.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b894e2f3873---64908327463.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/k8ihlor7nulfu2tvkm0cknll66/38794753705.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/gonujep.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/22294767552.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/pipigilatowopinep.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98865932704.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/dd263f217118ff6d83bc5b0831f78a08/deveb.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/e3b0d47ce6e218d2a92eeafd99d8a65d/pudozubevabaxumam.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/fukepozamosofudamatuweg.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/58877893308.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d6133d85a90---55241074432.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/809b4jjc1gg993qk0ocrianor6/loxujit.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/40e817cd1ce71d178d8555b8a68b4f6b/rikuxav.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/bezevebajiziwexo.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/xusivujebeja.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bf6a55303---25986640141.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607863c2ef655---54318729170.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/cfc2cebccd759cd2add11aa2199b47cf/99479723844.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/kejamagema.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/t1qq0dnq6e7heoqhpqrrg38bhr/wikikisiwul.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/wiwomobosuvusivisujekolij.pdfIn PDF document text
    • http://sun-tes.ru/files/file/lakipisile.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000145f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145F5 21020 bytes
SHA-256: 3883041c1e4e669728fab19f8df21e41d6fdf3aa829fe486488b25b2673d11f0
font_01_sfnt_off00017d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D7E 11280 bytes
SHA-256: 26b60300f98b9b8070b47056a91d0fb16ac25cada71d21dd3f8f82d8ddcb9faa
font_02_sfnt_off00019795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19795 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001afa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFA6 16084 bytes
SHA-256: 325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7

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