Malicious PDF — malware analysis report

Static analysis result for SHA-256 241e74be930f41e1…

MALICIOUS

PDF

80.0 KB Created: 2021-08-05 02:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 672683307115818db0ae990441828370 SHA-1: 5d3a76af6daa77732e1369440c766739cbc60c35 SHA-256: 241e74be930f41e1fda34a2443d36227f283a8aa8096a580856f7854fc158033
176 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/90q7auvlvhuae2ijls650ad509/69196205623.pdf In PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/7e010ef0930487e54dd20109f3ae89fa/lepibotazefolafojedo.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/17019854186.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/s34tfbjm1mmc72qtqi9rmlqea3/luregewekoke.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/sibaduligum.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8102252ab---70940507228.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/fepomefuzufisunidojatabu.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/27e1dfd0b0455d4b0cbec64308f164e2/45045477464.pdfIn PDF document text
    • https://ijpdua.com/contents//files/46437972447.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/93433439518.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/toxije.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/taveruboxopelokonovir.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/belukunigisarafifatuwepuz.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/99873671493.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/v9icq4emgv0q1flbm0gff9fbs7/nanomenateg.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/39d1b6ac5c48d2cb4bccce90c525855a/25327115055.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/garaxutidoterosoxijoj.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/716cc76fd4bdb2f7ee813d0071c46dcb/24571482524.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/e748f5c50758c52bcca2345eeef339e3/sunosikegalevajepimejutit.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/joxabijikapakerum.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/12932888928.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/rifaletadalilelexubav.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1607400014bb5f---rudevegajujaj.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6a5da94922---rasuzutipawonujerafobox.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/70374767873.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/87683319b669fc19793332ee59218b39/7131429109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=chura+liya+hai+tumne+remix+mp3+free+downloadPDF 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_off0000d204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD204 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA16 17268 bytes
SHA-256: a384ed6e7682e76f51541b5255ac50fcbcc8fe1ef7a55162aed029f0a5454933
font_02_sfnt_off00011687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11687 11200 bytes
SHA-256: 1fe180f44e656583e168bfc905d87d82da66ccedcfb74daf7f2fc570bed3bdab