Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9fe1d755924de1…

MALICIOUS

PDF

87.5 KB Created: 2021-06-29 02:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3778a6379949be6ec9cb22b042ab348b SHA-1: 0892a399ea32c617c724978713803bf5830eeae1 SHA-256: 8c9fe1d755924de1cf06c1c847a9f3b91ad1f091feb9f53d8660d3cc2e91a30d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to external malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://seabeachthailand.com/UserFiles/file/fuvevaduxiwalotefa.pdf
    • http://catherine-massage.com/ckfinder/userfiles/files/fafiluxugevegane.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01c920e317---joxizufilidiponidu.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be7a872fd0a---fizujegokewubotelotezaxul.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/ue9iajkq45oeum5b7k436suvh9/tanope.pdf
    • http://demkapi.com/resimler/files/kodap.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74a84aa845---4511935004.pdf
    • http://suttonoakfarms.com/clients/880813/File/togokuzujalafuvikumul.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/86c4a06054c5a1876e56d6efa0da82e6/15628559129.pdf
    • http://secretinvitation.net/images/files/vifari.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/447d2eab117564f3d1b597b98dd91328/72662557446.pdf
    • http://aldara-latinoamerica.com/userfiles/file/78878908149.pdf
    • https://amitadevnani.com/userfiles/file/lidelibusutovirulebaxijul.pdf
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/disad.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/cf68452180eed2e63a0eab37434aa60f/88714211721.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/hva6l36bk2q2qbpt83drtl6kp7/sitovojumujabu.pdf
    • http://aristosaigonhotel.vn/uploads/files/39801599949.pdf
    • http://www.rify.us/cms-uploads/files/lajalebuwowejumo.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/4289223e9c9c1f7e0b57c49a080dc866/fobojudewedes.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/5099860053f0dd00dfaa9538e6e7cec1/rimasikuvanamidude.pdf
    • http://pokemom2.com/uploads/files/6826424103.pdf
    • http://rymwid-training.com/userfiles/file/talepogojepenojolemi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dabe724ff7---fewujufigejezogidanekutaj.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f17340c09d---rutifukulewufogasa.pdf
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bivakilusilogiwimowex.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+speed+up+defrosting+chicken
    • 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_off0000f0c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C1 16792 bytes
font_01_sfnt_off000108d3.bin
680ee0f607d121f86e0aa17dbb8d2525f8198d65e9b537a74a0874cc3839f721
pdf-font-stream PDF embedded font (sfnt) at offset 0x108D3 17204 bytes
font_02_sfnt_off000135e0.bin
f6c1933df9d7ba9c0b280c6aea747ab36e860d31f70bf23dbe4ee78b47d3d1ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x135E0 10960 bytes