Malicious PDF — malware analysis report

Static analysis result for SHA-256 3deff2c179e4b5ca…

MALICIOUS

PDF

99.2 KB Created: 2021-07-28 03:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8fdba11967af578b5a10e20dfec3b373 SHA-1: 47e9f81518991c832005a8154ecb69f7cdba892f SHA-256: 3deff2c179e4b5caa8f361eae32f4fceba2b6be7e8df5b28324bad049d7e642a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous URLs, many hosted on compromised or disposable domains, suggests a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/c3eb35cccc15f23a77d2ea8afa22bcf0/54076708758.pdf In PDF document text
    • https://clubslotalmatriche.com/calcas/file/warojefuxokojonagisobal.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/pesizovovobememalixunaf.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/211222201.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/37767577522.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095d84def828---13771843765.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/ee9f062840aa49c819f71b09f5d4f285/motudogisego.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de0242eddf---93033661101.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/1609924269.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd59ca8b04---lazakabakobizaxax.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/gubelunoxitijon.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071d19ef1835---saselutilovivejajekoz.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c84b486305---31389261657.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d1979576b---gozedasufatojazexapuk.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e6693207a---rufifusowevexa.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/masagajoziwu.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adcf22b290b---10143411957.pdfIn PDF document text
    • http://kezmosas.hu/files/file/kedoruribot.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed0cc0fe29---86922105999.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/31735062563.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/vipatiturovejigan.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f58a730891---68048906792.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a149beee293---24680294819.pdfIn PDF document text
    • http://envigest.cz/upload/file/kamezala.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/zivusetikazibobametitus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=download+bts+wings+tour+final+in+seoul+fullPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00013967.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13967 18048 bytes
SHA-256: 69896f3c6b7c30b76689f7c947c4318f93ab883f81bd64760f932bf1b12438ad
font_00_sfnt_off0000f1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A09 18068 bytes
SHA-256: af1a14d7211130da2e159f5b310fd5579847bb3cf37d3f3e106e37017066dbda
font_03_sfnt_off000155b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155B7 3084 bytes
SHA-256: 4c2b85fc2679a09bb73b339c33058251eb0e631d49a0ec8e11813d54f47b461b
font_04_sfnt_off00016230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16230 10856 bytes
SHA-256: 4cdc6d58c830fdf10828d98b813cf1de332581698c84a6a8e19f76a160c7f1af

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