Malicious PDF — malware analysis report

Static analysis result for SHA-256 15365c5eaeee20c2…

MALICIOUS

PDF

89.1 KB Created: 2021-09-02 05:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9700fa9a7820a20ed1d3b1279708eb8 SHA-1: 585b625a42f0dabf2ca4c9501399824f3cd2f1d6 SHA-256: 15365c5eaeee20c2d422c6798a90f4cca63531b19e572c1c4fd5d3bf4fff7361
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various websites, many of which are hosted on disposable domains or compromised CMS uploads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of many unknown reputation URLs strongly suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jamuiboe.com/webroot/upload_media/69803567436.pdf
    • http://jyjwqj.com/uploadfile/file///2021071321590064.pdf
    • https://iamtimeshare.com/userfiles/file/25647836559.pdf
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/vizavod.pdf
    • http://aryajob.com/user_upload/file/jidenaleridijulosuloxaka.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/057e4a27dfbee403e2e8f908e2d33463/biterulavuve.pdf
    • http://www.tomasjelinek.com/img/pub/file/nifinotanovofor.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c9f010e9d---1426587463.pdf
    • https://dbmotorbrokers.com/userfiles/file/bepinuzagawatafamu.pdf
    • http://cooperclassof1970.com/clients/9656/File/fogowurudiboket.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/5c5826ff65a121413c98cddf2dff1d02/4661870438.pdf
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/taporuweges.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607afb1107acb---38113726407.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c899ecf37---gotenamuna.pdf
    • http://954move.com/clients/4890/File/44153583637.pdf
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/zevenedetuler.pdf
    • https://klcmekatronik.com/ckfinder/userfiles/files/gekebojenadujadebul.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/466ff96d6e3640917e47f774cd1bab52/kupupuwemagekedabi.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/d3e759fde62198590b762dc8b70f7df2/mifoxetenur.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/b995800765747f90d59efa72a570d88d/xuwade.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071af0b6eabb---28775639751.pdf
    • http://ctkupavna.ru/upload/file/tuwivi.pdf
    • http://piri-piri.pl/ckfinder/userfiles/files/8133315830.pdf
    • http://rogo-rotterdam.nl/files/wiladerosum.pdf
    • https://veaodaibrahma.com/uploads/image/files/19396320070.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=forgetting+sarah+marshall+online+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f548.bin
c13df63dfdfe3748ece86f86be0aed70bc6dba6625a35dcabf58176f9657afaf
pdf-font-stream PDF embedded font (sfnt) at offset 0xF548 10640 bytes
font_01_sfnt_off00010d66.bin
ae0e41e197f2acccbdf14a1083fd52ab701eb3c407e2203790009d55f97396eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D66 18268 bytes
font_02_sfnt_off00013da2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA2 16792 bytes