Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d79777c8299b4c…

MALICIOUS

PDF

85.9 KB Created: 2021-07-03 15:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 602bf7a33c0de8586886e557b8eb1bbd SHA-1: c9d1669b6e437f0cc9ee3c4578d8b7fc1569da30 SHA-256: 19d79777c8299b4c691e73a429f2a83491d4d089db2c7cd341e6f65b4d97e55c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of multiple links to potentially malicious PDFs indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/06u30e4mdk6pgta1mjeous5669/sofifotuwubasibepomor.pdf In PDF document text
    • http://posekatzahradu.cz/files/file/bopisefadopos.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160abef5ede579---45194930653.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a77506aecc---lepitulab.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6743ef1de---33177953126.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/96961267967.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/26727667858.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724d92aee6d---rejawiniwometugoge.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/56887581382.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/2654208877.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/1713d82d4364ee786730bca5315457a4/paxofunodasazemeze.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/wilajir.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8fe5601e9e98f8d0c9ec2f92c9bec72b/sudisifenexuzipugovafuva.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/3097644065.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608767099b4bb---gerixatizipulew.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/suxirupasalatidil.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/87029453295.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/39195615289.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607873f387e9e---90828258957.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/rukibav.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/lbe71v1d0svgq2ecdgschpdb73/38463654585.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bd10afa58ce---73005079843.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/42126307141.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210524214256156.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/gt121nj1nmskgn9t16r0rmgar5/93156885255.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=hush+little+baby+song+downloadPDF 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_off0000eba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA8 17588 bytes
SHA-256: 8aa7effff2a3b5289856712ba6025f0450759a9c56da8d98e8ea6c41f16e48a2
font_01_sfnt_off00011a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001322e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322E 10860 bytes
SHA-256: 10a16f8e6808a539ec5a5005a6b9ec038a39af317eabf70e69f50e86799c7bfa