Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bacb1502a705f75…

MALICIOUS

PDF

86.0 KB Created: 2021-07-13 08:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a3b9bede81bc9ced0c9accfcec21464d SHA-1: e4922992167bd6c46e87b50747597014478a5c01 SHA-256: 6bacb1502a705f752cf8ebe8486296fb72c2a7cc72b02bd6ae05fe47f4b463ab
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-severity PDF_RANDOM_URL_LINK and ML_NYX_PDF_MALICIOUS. The embedded URLs point to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection further confirms its malicious nature, identifying it as Pdf.Phishing.Trojan. No scripts were extracted, but the structure and URLs indicate a likely spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://jyotiacademicpress.org/uploads/file/zewisefi.pdf In PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e80bd61a7---9573979275.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e85e262cde0---tuniwotukelexowafimux.pdfIn PDF document text
    • https://hifi-markt.eu/kunden/kronhardt/ckfinder/userfiles/files/kadusog.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c64fe84e718---97444496704.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/ruvixuzukijitumokogosuwop.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/lizibenuxu.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7070d1571d---degolijebamuleji.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/lilobonupe.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078470e17ba9---rosoxijir.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/wapuzirofef.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/pufizuxesekawo.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607053751484d---2446288582.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877c2761f1c---46621462942.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/klq3o4maf9mdhohu5v5i29rh97/dedalidafotezijotin.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609943f95bc20---38593584251.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/tmthj91ef6n098i95rl3sr6754/46831878046.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/fedanadilovon.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/dozigebufumeravewozami.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/e8n0f9o0gb4f0eehednt7i3993/66309207759.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/ba9b9fdeb1c81945a8551f2e591bc15e/19491291092.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/xemelepo.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/feteguxelori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=cold+and+callous+meaningPDF 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_off0000ecda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDA 17784 bytes
SHA-256: d22411671411278ed11292174563db89d19908df499bcce5040fb2217f6e82fd
font_01_sfnt_off00011af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF7 10644 bytes
SHA-256: 850fa7cbe288c7daf8423cb33b6c3bca0b51c2671e2a23d40bcf4dea4318199e
font_02_sfnt_off00013314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13314 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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