Malicious PDF — malware analysis report

Static analysis result for SHA-256 412083249f5753cb…

MALICIOUS

PDF

83.6 KB Created: 2021-09-17 21:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5478d70a382123eea850aeb47cfa2cbc SHA-1: 157c5e1d1d08cb84fc4ffb0e594b6c2ffce9dacd SHA-256: 412083249f5753cb32c1fc7d0c8d72b2a00f363dcea4766b850e58f70a199ea6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The presence of UTM parameters in some URLs suggests an attempt to track user engagement with the lure, likely for phishing or malware distribution. ClamAV detection and ML classification strongly indicate malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://irlanc.ru/uplcv?utm_term=cashapp%2B%2B+download+ios
    • http://nickels.design/ckfinder/userfiles/files/52893105282.pdf
    • https://cordovajewelry.com/images/file/22618767066.pdf
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/rudozopexekinegeridodoxi.pdf
    • https://ferado.vn/userfiles/file/veginafelatib.pdf
    • https://jurvamartin.com/userfiles/file/rekapugunikusobimu.pdf
    • https://cheesykeju.com/contents/files/60341975615.pdf
    • https://foodvellythailand.com/upload/files/70832679518.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/a6bq08tlsspovo56utfpk2ht6s/medanulivatodize.pdf
    • http://samtekelektrik.com/files/zolasogoxe.pdf
    • http://gangwonbnb.com/FileData/ckfinder/files/20210902_42733D6F0BCC1C48.pdf
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/vufexutusobekideru.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138808b657d8---60992990384.pdf
    • https://mayphotocopydogia.com/upload/files/67761231366.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133216cbe786---fisodod.pdf
    • http://lso-msm.fr/userfiles/file/2357235971.pdf
    • https://chilegastronomia.cl/uploads/userfiles/files/86829465148.pdf
    • http://kag.fr/userfiles/file/38161197338.pdf
    • http://emaaravm.net/upload/files/desejozelojowixegemap.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/265b00a047133457e3cbb7318d51d222/kusufofimufalali.pdf
    • http://cowmoo.org/ckfinder/userfiles/files/sugorejamebojivip.pdf
    • https://aashianarealty.com/file/8819330266.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/161307bdf675b7---81553838569.pdf
    • http://laihoawedding.com/app/webroot/upload/files/58280945654.pdf
    • https://gdaniec.com/upload/files/novumawuxi.pdf
    • http://katour.ru/admin/ckfinder/userfiles/files/32514262662.pdf
    • https://cissud.com/uploads/ck_editor/files/fevelikoderatepep.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4a9.bin
ffbf9ed4ba2d89d94ff2d7308e2a3d8e2987cafa6c3275cad69a9f720591dc74
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A9 10276 bytes
font_01_sfnt_off0000fbb2.bin
0c3f3af17fb4de5de58dab57c855d00c1842a3a13da9a57b9cde1f864949e631
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB2 17428 bytes
font_02_sfnt_off00012893.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12893 16792 bytes