Malicious PDF — malware analysis report

Static analysis result for SHA-256 92c97799268f8d4a…

MALICIOUS

PDF

89.5 KB Created: 2021-08-13 07:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: e4fee479211fc57e6f2ecf86693414e7 SHA-1: b0b9021a8ffbaec40d170d6300f122810f6e67ba SHA-256: 92c97799268f8d4a23df7c12c491d404ed61b266c7dd8738765cef82825d56d9
156 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute further malicious content or phish users. The presence of numerous unknown URLs indicates a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161076fcf39723---nimomenemusiwofebudalo.pdf In PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/2f28395eb3122ab6db8d1a9089c3c2c5/moletitunepewosupaw.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/lasezipowaligekenaxopuw.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/a8ff4806a719f68f6c025d7243f0b545/tagagijizuxapapawenebiko.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/a2ed9b18f4ccf55b81901f3b2a3053a8/90538926210.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/65104129614.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0f284b5af---fidirulivipekujamuj.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lepakerodekinud.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ede584c36---zarakasojodiwukotunemas.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/14268993790.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102da453e083---55035288787.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/928er8uknqcl075su4rplulca4/tiniw.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30d0e52744---43668131099.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a56c5a94ffb---75562459816.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/sukamatotadapenaruw.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd2a3238d1---disepimowomapibaduguro.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/nagidiperodamepilagu.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/16681454325.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607048596a046---kujeruroxeb.pdfIn PDF document text
    • http://boisehighclassof1965.com/clients/879780/File/demebaxibi.pdfIn PDF document text
    • http://teckim.it/themes/userfiles//files/41929399621.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-23/20210523132220752564.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a1e4d9993---zupomasebukolataxuzebevix.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/60707148775.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/34297196538.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/efb88af35b8d833d1a001f4d9869ddde/davufawovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=bts+chill+songs+playlist+2020PDF 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_off0000f8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11110 16916 bytes
SHA-256: a15fd8a3653042f7c9d5e91c92a88320a17295b65afb2bdfcd4b82924507a4d5
font_02_sfnt_off00013c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C91 10828 bytes
SHA-256: d7d9140c214abc7b0627d9acbf079a951c78985d73488a91ab2ed9598c4d7286