Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0bb6183c88d4adc…

MALICIOUS

PDF

75.3 KB Created: 2021-09-20 01:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a683ed57a9eb19c169c26d6d9db43d73 SHA-1: 9fa27c86f6f8a9244b38e041e39c6dac1169bdaf SHA-256: f0bb6183c88d4adcc4d72af4136a62a1d291e8f52d1edc6dea0f8d3603efcf59
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also functions as a link farm, directing users to multiple compromised websites, including those hosted on WordPress upload storage. These links likely serve as a lure for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=mx+player+world PDF link annotation
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/467cca20c75c4aedfd78e64afe73cac0/84971609122.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/4764695483.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/57153162451.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/22599955222.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/vozep.pdfIn PDF document text
    • https://suksesunited.com/contents/files/14214976553.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/89e0935b53dcc0d685d8dd17af93e9ff/93961814255.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-4/20210904175508409920.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/pejumomuzusa.pdfIn PDF document text
    • https://eltdb.com/UserFiles/files/23011457475.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/tixotibowil.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/tofowelul.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/jiripukununenunagunezij.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/dokitolegetorobime.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/gobafivurafupumowob.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/81639784731.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/fogonotarapaxujegiduku.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/53530143020.pdfIn PDF document text
    • http://screen.by/images/file/82874983491.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/sidapiwaw.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16133637bc8410---94140694759.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-16/20210916100154476131.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/juxokajojuwiwudavabimu.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/tipiweno.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/jelukemowexe.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_off0000c2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF6 10216 bytes
SHA-256: 56bf08449903e287716588ca98baac7cff3fc6a79900ce58fdcec41aeb92efcd
font_02_sfnt_off0000f214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF214 17552 bytes
SHA-256: add6ed53ccf18022bf5304131a8444b67c421300eb26d28fb719d7dca389746a

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