Malicious PDF — malware analysis report

Static analysis result for SHA-256 e076290351cd4150…

MALICIOUS

PDF

94.5 KB Created: 2021-06-28 00:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 628f764f30ebf704bb5b30c2eb952e9c SHA-1: 84a9072b79205c266403e5b2d5be605cf89ecae7 SHA-256: e076290351cd415067ea286a8383e0a69c2a7352002a4375d8fb7fcdcb653270
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS upload directories, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are consistent with spearphishing attachments designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://garglob.ru/uplcv?utm_term=kick+meaning+in+tamil
    • http://akgikorea.com/file_upload/fck_upfile/file/10542891596.pdf
    • http://kapelski.pl/userfiles/file/daxavezapubawon.pdf
    • http://www.elstar.ru/uploads/files/50774690878.pdf
    • https://przyklejki.pl/userfiles/927918648.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/ac600b7a96122b14180acecc90b79aa9/28040999789.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4dae335dfb---90823453812.pdf
    • https://bhandarisurgical.com/ckfinder/userfiles/files/rofugepemisizu.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/vhklslck9887bahks5g4dqhcg3/letanikotuw.pdf
    • https://anmimar.com/royal/userfiles/file/81809329187.pdf
    • https://mayurherbal.com/userfiles/file/dofopomunarotogufulowaj.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b80ff3e4aad---1778867332.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8bc54d0336000a58e59950110d212414/15662995012.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787e89513c5---simiforumororomeg.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/f74008c650687d2b4f399fb1adfcca3f/zosejeg.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16084f8e2081f6---luxizofokig.pdf
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/68144317934.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f5e41a802---luvarunaxik.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/s298q4d37r7qllt8tep5gpm4f3/20775584866.pdf
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/sokomazewusetufuf.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/3bbb5662e8b827f145483aa164f97737/54212769994.pdf
    • https://artenika.pl/fck/file/wamovowoxubepisevud.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/c51e470d78672c1dda5b7cade4007ba0/xepadakikafisigitilad.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e79c896ac---39789069979.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/dd99a81e6fa86a61e350294fd339ffa2/tamasezurag.pdf
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013712.bin
d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13712 18328 bytes
font_00_sfnt_off0000d567.bin
5039ba39493881b24201ea2099fb62e55797d92954cc08f35f4ddf8448eb3bb8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD567 24304 bytes
font_01_sfnt_off00011182.bin
a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x11182 3464 bytes
font_02_sfnt_off00011f01.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F01 16792 bytes
font_04_sfnt_off000154b4.bin
e1bbcd327ffc649cf0d2708a0db058aa4db1572b987cc3f2eeca8b5480ac085c
pdf-font-stream PDF embedded font (sfnt) at offset 0x154B4 10268 bytes