Malicious PDF — malware analysis report

Static analysis result for SHA-256 db99a359a6e48989…

MALICIOUS

PDF

106.6 KB Created: 2021-07-01 13:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 66007836824b5e76ef0a48daad9006a7 SHA-1: 972887d5f6c1be02a8df2619fb18d45da3774cc0 SHA-256: db99a359a6e48989a7ddad396dae68e759bfc41cb21bcd544f748f65ee03f14a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting. The heuristic firings indicate this PDF is a link farm designed to direct users to potentially malicious content. ClamAV also detected this file as Pdf.Phishing.Trojan, further supporting its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9792

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://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/8141d08903a6241ad0c762e65ada7f23/90370266836.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/548efbm80j0a6umqenngebf1kf/70390137850.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/1mp82iqv06eqel0rlhq7b3vup7/24940223082.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/660dd4e94db1c5aaf0892f6edd232cac/wixoragisosikel.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16079fd3440ba4---kavemefugusi.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/teveti.pdf
    • https://loctra.net/userfiles/file/bujafukoxubeloriwexiro.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/a6f3719491d57c1e27351ca170508e46/85002938738.pdf
    • http://nowyhotelik.pl/userfiles/file/sovid.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce65482d0d---bisexeju.pdf
    • http://mea-travel.pl/userfiles/file/fobulutagaperozo.pdf
    • https://1877painters.com/FCKeditor/file/wobejafex.pdf
    • http://stalmost.pl/userfiles/file/36459239616.pdf
    • https://ivanamihic.com//files/60058163741.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/7f89499ba5d18206c8ed310de8e00dcf/pojawumeb.pdf
    • http://promocode.lu/userfiles/files/sazibesig.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/066b7494a0a2000afd0951ee64bea045/jebasik.pdf
    • http://mamnonkitty.com/webroot/img/posts/files/vipipik.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/35738371.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609469bc9786c---wideduwabesomirot.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/87f084f10c12f98cd20033fbfcc31dce/nutijukokukamivat.pdf
    • http://amexeuro.com/an3_Uploads/file/dejurutunigo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=kingdom+hearts+2+ps4+trophy+guide
    • 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
font_00_sfnt_off00011165.bin
a43bc442c4363a90857d8ca7d1f8282fa8386be927d04fc47d8bed34dd23d939
pdf-font-stream PDF embedded font (sfnt) at offset 0x11165 17880 bytes
font_01_sfnt_off00013f74.bin
9705f8fd42795e266f5f92d580805e9c44abb97e9df25d84bc229b16b5beda45
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F74 6188 bytes
font_02_sfnt_off000154f3.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
pdf-font-stream PDF embedded font (sfnt) at offset 0x154F3 16092 bytes
font_03_sfnt_off00016a38.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16A38 16792 bytes
font_04_sfnt_off0001824f.bin
682a039728a3ed9049da2212bd8abd38514173150c8fdca32fc9bb02c151e778
pdf-font-stream PDF embedded font (sfnt) at offset 0x1824F 11196 bytes