Malicious PDF — malware analysis report

Static analysis result for SHA-256 bda68a8fbc632c03…

MALICIOUS

PDF

90.4 KB Created: 2021-06-28 14:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 00feeb1ed0202495591137c0ea600534 SHA-1: 38a822c8ac806505b9a445f22662cb9ad55ad1ec SHA-256: bda68a8fbc632c03073de4235fd267d62f0f3c4d5758a9e296248ff27327a0b2
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The presence of numerous external URIs, many pointing to compromised CMS upload storage and link farms on disposable hosting, suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, likely contains lures to trick users into clicking these links, which could lead to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=piano+tiles+2+mod+download PDF link annotation
    • https://gregor-biffiger.ch/userfiles/file/47197032228.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a484a1daf22---77910252246.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609415c64fc1b---37699488194.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/t37l38k1ls86q20rr0m4hpp68t/jexivolikemaj.pdfIn PDF document text
    • http://bjallstar.com/upload/file/zorogubigexozuw.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/76539608677.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/totitokiruvexe.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773900aab2d---72208440478.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/fepeg.pdfIn PDF document text
    • http://millecolori.it/images/file/95604586054.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084571b71147---53053268676.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea1006ef09---fiwawej.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/e5b472160a11840e5ef604c9e1c2f1c7/posezanunodovipaf.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/kudazexetelidaxabuduk.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/93c7aa943debaf516748355d0d1c0d05/nafajutekakasalobobemip.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/d121fe38d17e69717b164afeed3f90ae/waleno.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/sb35g4lcm6ln8tm58llcktlg9g/kezeleniweziwixete.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/39808519362.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/9869eaec75a185f648dc2f62de62cff4/simoxoritozukutomut.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/ollhdauno38a6gdcocnf3g41vk/dijidejiluxorisofijoza.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/vupila.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092b34c9f38e---rojajapejuruwiz.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/82203269969.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/goxebudutogusa.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/0a3a8e7a13cf0a2d33a499cc60b70d63/sulatebadaken.pdfIn PDF document text
    • 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_off0000fd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11537 10516 bytes
SHA-256: ae184a8b47016ac418594a5af27857bc6fc5b5c49440df290fa6eb8a38a26fd4
font_02_sfnt_off00012d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3D 17948 bytes
SHA-256: 5e99abface96a501376afda06688ac95561efeaa84417e68b72315f50d8677e0

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