Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f22f29c4bd54772…

MALICIOUS

PDF

71.9 KB Created: 2021-09-16 14:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 88b8c951e230717a91c8c3a35ab727d9 SHA-1: 788ebea15d6b0238fb5fbd07f5ff42f3ab229ea3 SHA-256: 1f22f29c4bd547728a32e66ff5190d7f5cf6d5c59d9b428b30e9911edb19be03
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS uploads. The primary goal appears to be redirecting users to external sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://bugaboo-buffalo.eu/UserFiles/File/94519611846.pdf In PDF document text
    • https://newfrio.com/userfiles/files/lawiwopufavoredax.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/dogep.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/59545886438.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/63ae0731ca6d5edaf069b1fa25361af8/376830961.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fef7e8d95---57328015639.pdfIn PDF document text
    • https://anakmeong.com/contents/files/vunovebudil.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/18416174556.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/62ef27b4dc121f01ce4ee330a43c8c3d/42457658793.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/wuguzurivolafuz.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/46751498949.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/81851128262.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/30228110038.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/sogugisidemilo.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/bizifazegexi.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210909084558729618.pdfIn PDF document text
    • http://esistore.be/userfiles/file/42933745978.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/41988697292.pdfIn PDF document text
    • https://geloracinta.com/contents/files/16039071814.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/50541650512.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109090518115973.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/85297786995.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/sodinolanotudokili.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/84876101380.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/5beeb55cf3e8716301fd4d1a573beeea/82689362632.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=papa%27s+pizzeria+game+unblockedPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE5 11184 bytes
SHA-256: ad80d6fa6a34ae33e817bac1e916cd61cb09322e41315b1fa99c68077871906a
font_02_sfnt_off0000e7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B0 15912 bytes
SHA-256: 8aaf153a844e92c4c32358739ac1e389ed099b2daf319db839e9899353643af3