Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51703cbf8c43858…

MALICIOUS

PDF

78.2 KB Created: 2021-09-16 23:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d5fbf1980f1f0a38165e7a39d44edfef SHA-1: ceb9ea63c103bf78a6acf333ae54986ff5433a79 SHA-256: f51703cbf8c43858c9b39fb9b1ca2c59a66a64244f512e667210d38d665d90c9
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users. The presence of multiple PDF link farm heuristics and the ML detection strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pegasomeeting.medcoast.net/ckfinder/userfiles/files/dubegi.pdf In PDF document text
    • https://groupburuemas2.com/contents/files/72965137858.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/lojevuzavimolebotap.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/vapimikevuju.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/pevutorudulolowir.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/35541652973.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/rovimatiweg.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/70022163359.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/fiwalawerusutala.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/vofasutawuvi.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/f222d19f299845a64bc66b5188f79461/luwogapamikigebojigeso.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/deziletavodozifi.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/poletuwofigo.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/38lhgstevqg4b6pa2t4lff1832/41136608423.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/tanaseviniwon.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109020906388278.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091602571773499.pdfIn PDF document text
    • https://bursaphotofest.org/uploads/files/86817931574.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/21578724892.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/75918948188.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16138d10e97ed3---2377419313.pdfIn PDF document text
    • http://chromoink.com/updates/file/nujolomejuni.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/8908901286.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/nexexonanijagedira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=longman+preparation+course+for+the+toefl+test+pdf+freePDF 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_off0000c336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC336 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB48 20820 bytes
SHA-256: 5ee0e862a62b06c88d92cbb0664718c5aa082ca193ee7211bee4ca50391df032
font_02_sfnt_off0001116a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116A 11124 bytes
SHA-256: 258bfafba37ae5261343ee503b7325a2d39fcf6207423ce590430cdc087b6194

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