Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a17652b4c2ff45…

MALICIOUS

PDF

79.5 KB Created: 2021-07-03 06:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ceb1641fcb94c6a7e5ad7c2891631763 SHA-1: d67f06b001b43ddf5cb2eedbb28b9f3887f09451 SHA-256: 55a17652b4c2ff45165db0e8e2e6681779ddeb9ea3b498895f7716ffa6bb43bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV and an ML classifier as malicious, with multiple heuristics indicating it functions as a link farm. Several extracted URLs point to compromised WordPress installations, suggesting an attempt to host malicious content or phishing pages. The document body is unreadable, but the presence of numerous links to potentially compromised sites strongly indicates a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b63ff4db86---61785877313.pdf In PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/xusagawogarakadoko.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210629105225.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce784a46e0---11641563819.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/zafulidagosugilevu.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/39784594848.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/3424ce3f6ba4b7b35b6896d7b07f8a0c/tagevosuleduxufa.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/e68127f3ae8dfa045f8a2c6139c3620f/3550242548.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210619020606.pdfIn PDF document text
    • https://ttnthailand.com/upload/userfile/files/jodibupelevu.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/kewavemirizik.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/78810edef02e0ef70b8226ee41dac913/vibofaruzufonoxumoliziru.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com//app/webroot/uploads/ckuploads/files/80627618399.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607febf6ccb74---tidabo.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc28589626---gugamoxufowafowotako.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/1ae1ad997858fb31109513041d8972fa/tawilos.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/miwigufolisetogubem.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/wunukalokaxiwan.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/7c4681517e9230e7f5737923c9fee1a8/90252694564.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/rogipireberulebun.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7aeafa9d7a---70640715879.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d3fbc323c---memitis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=valerie+piano+chordsPDF 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_off0000d320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD320 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB37 10480 bytes
SHA-256: acc137266ce0db80811f5addb80e4f3891bc6e8d430e95b0190c6d748a723324
font_02_sfnt_off000102e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E0 17540 bytes
SHA-256: f65d7791e03b72f4e76edfee642fbe588a67da6a3712a992ff939ae3a609ce1b

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