Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca219348995986d…

MALICIOUS

PDF

80.7 KB Created: 2021-08-23 18:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 81bd17bea09489216767d4f0aa788669 SHA-1: b511e86de1d3ead6a4379cc5b9c9dd907142b177 SHA-256: dca219348995986d7d3d1a9ddfef3247bf17ca40222a398bf242b749b045dc28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/834eabbd2c8e9d658308cca9951bd39f/99205390531.pdf In PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/polepozugavonibejori.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/88089377620.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c9543458a---mexofigosexisamimewob.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/30020908528.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/nijesadinolusozetoxi.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/1942814649.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/begiriwamapawevunefafu.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c898e942cdc---84783444017.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/eiq2d7ovdbugm3nsju1mrfdlp5/fugofudi.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/lazivuxitebexubavo.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/96108664246.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/39686686772.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/1698e8189dad5dd01b51e271143ce772/kujizobox.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/55333752182.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/69272365088.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/68ab9dc604d5c713d0ec16792f8d1180/lalanixofugiruk.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/1c8kls20fn27or5gipvntigv4i/13861218866.pdfIn PDF document text
    • http://getvisa.ru/images/File/sujironegaxeroxuga.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210823170144611.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/zibaremefezoganonojoman.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=persona+5+royal+devil%27s+dictionaryPDF 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_off0000cf9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9D 10712 bytes
SHA-256: 08b2f877fedc8a9ba1f1f81ebe91ab5d896f567e5dfeb8e95b8309fe444f78c4
font_01_sfnt_off0000e875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE875 2092 bytes
SHA-256: 9124585581176a098e6ac075c14764f74c103684bea3bc1829e6893b88ca9c36
font_02_sfnt_off0000f204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF204 16704 bytes
SHA-256: c1b461832d89da11cf6e576cec8a2b2129ec71cb1813bc8471643cd55cbe5781
font_03_sfnt_off00011d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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