Malicious PDF — malware analysis report

Static analysis result for SHA-256 80bb99ff2ff9b148…

MALICIOUS

PDF

72.6 KB Created: 2021-09-01 05:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d77acd21160b20fb0950a8ac54ed596 SHA-1: 7d160f87c941b6ed51b060b70bc75753d030682e SHA-256: 80bb99ff2ff9b148df1aff197e76a3d4fb115804a0434662b65604bec3c8da14
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as containing a link farm hosted on compromised WordPress sites, indicating a phishing or redirection attempt. The ML classifier and ClamAV also identified it as malicious. No scripts were extracted, but the presence of numerous links to potentially malicious PDF files suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160887ebcd66a2---78910338467.pdf
    • http://sinoscaform.com/upload/ckimg/files/202108220018468346.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04f18cb5ac---91359111694.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba59ee008---ramut.pdf
    • http://lagrupacio.cat/file/58828070223.pdf
    • https://motelandratecuci.ro/userfiles/file/7883891783.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ud76ioq8v49v3uiu6i4h18toka/vanakufizupude.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/9830153b0982694b3d0504de276c214f/gozowozo.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/8sqhukvt1bcmlk52qa67gg9ds1/98057033697.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cba7a3bb793---tinukelik.pdf
    • http://musiclivemarsala.com/userfiles/files/duletokoku.pdf
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/71565677280.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9ea44b498---ganifedut.pdf
    • https://santa.sg/images/users/00000000/files/44859880074.pdf
    • http://automotiveenergy.cz/userfiles/file/rijajemaxepijavifejofeke.pdf
    • http://zulaikhatextile.com/userfiles/files/zubavodujofapalotavefu.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161012cba89fff---zelafatime.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16086dc5545745---71206649844.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3837e2c7cb---puturevobi.pdf
    • http://centromp.it/userfiles/files/49184410366.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f36e3c725e---nufozikilutijo.pdf
    • http://a-aqua.fr/ressource/site-image/files/87127291451.pdf
    • http://cn-noah.com/uploadfile/file/500321943.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/dabdbp3hsv9f7oq796s9stfm1q/nukimikexujinez.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=max+recovery+insanity
    • 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_off0000bc5d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5D 16792 bytes
font_01_sfnt_off0000d46f.bin
a99506ecc819d2eaa93f83003799f0292d2938c69dc9f2b0ae30196b1e43cf72
pdf-font-stream PDF embedded font (sfnt) at offset 0xD46F 15956 bytes
font_02_sfnt_off0000fd2e.bin
09d31967ff0b18417f7965f7423fd6abfde8f87e85cc204776827304108ad9c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2E 10452 bytes