Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa6a803f189dc5a5…

MALICIOUS

PDF

99.7 KB Created: 2021-06-26 02:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 45b3242fb45a00e83c348a9003fb7c25 SHA-1: 82cbbd8edc17c77da9b7692d1a0013cd41ddee56 SHA-256: aa6a803f189dc5a5c149054996be69dbea77b389b24908bafc3ed6a88678edb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating it likely exploits PDF vulnerabilities. The PDF contains numerous links, many pointing to domains associated with compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple external URIs and link farms points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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 http://hainescentreasia.com/images/file/55375361326.pdf In PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/a0iu9f4msu55amefs9notgp39h/lizanemipadi.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/012f16af8ffb44df79e5ab0f00302884/tobonixowexim.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdcbf7bc9e---xukig.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/e2437370b25d20fc701f8645a2edcd6c/guxegudovowibodotan.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/vejemubilofaramun.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16079751dea5c3---veposenurutabajerut.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/e2cac05d4c93f902621edb1285c877cf/vakiwivajagekotewefo.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/9606525462.pdfIn PDF document text
    • https://marmarases.com/upload/ckfinder/files/29535091957.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5050cbceb4---zujokuwabajivozafuw.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/b55fbddd47b9909aee67ac837e3e356e/zowukopome.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090f6fdc333a---pewoxazexewapujadubalatu.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/49070991265.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a84e35854---geviwumor.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/bda2d7f10e1f0896c38d4a1d890da4d6/nubojujukusad.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/kabamejerawe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b316276f126---piwewetuzo.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/51f5a7028169ad62fc1221645dd543e6/wozifokodiwidokonekek.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ba41400aed9---85966561597.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/600ac0ab904c1848b4b29d38b2435afe/99377070537.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe45415889---pamusonimedapupeno.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rozefapilijejifawivif.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/og00rr2etpoeeqni6bf00mf0j0/41328516236.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/munoxezek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=define+epitome+of+beautyPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001031c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2E 21380 bytes
SHA-256: e298e364b088df03980942af90d48f4c1aaa9aef01de7be0005d42dbf4663518
font_02_sfnt_off0001514a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1514A 10560 bytes
SHA-256: 16f1b1766d94fb40530ae4e7771d93596ed8889cdf27e972a1bf0fc7594b7091
font_03_sfnt_off00016925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16925 16384 bytes
SHA-256: 6bc4420bbfa61156f096b6f0725168f8601d7500e332933a6f3144c23c09a2fe

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