Malicious PDF — malware analysis report

Static analysis result for SHA-256 5142f9a99b10cb60…

MALICIOUS

PDF

86.1 KB Created: 2021-09-20 04:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 60e70403034878cb17a53e9ce1073d28 SHA-1: 4d977453d31f7dac56dcd2afb2a703290adfca50 SHA-256: 5142f9a99b10cb60b13b13b17e3691d1dc3e0ae2801200f1a78a5ca6c6ef244b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. These links likely serve as lures to phishing sites or downloaders for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 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://garglob.ru/uplcv?utm_term=htc+evo+4g+lte+review PDF link annotation
    • https://pastijptoto.com/contents/files/17174427299.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/98620238051.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/lageleriga.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140157ab05c0---setetu.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/kodakesovur.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/befunozuj.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/gusasifawo.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/juxilikurone.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/lazesivumexoviteze.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/89462024908.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/40711903378.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/75472018705.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/lonefepu.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/bifuwotokimerural.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/xilokapiguvowujolidiwemuj.pdfIn PDF document text
    • https://0900107678.com/upload/file/samowegesumevu.pdfIn PDF document text
    • http://kaies.net/upfiles/file/96852356269.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/21950830547.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e32a0cb0d---ruzetuzafa.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/21147042571.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/witenawunufarufekuka.pdfIn PDF document text
    • https://datenglagi.com/contents/files/23103196828.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/36d79bf4742a1eaec269c89867705462/nokizekivexegawiforedibar.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/2648023519.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_off0000ebdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDF 18572 bytes
SHA-256: b60f436e209092dc7b537f2c7a0fcabc120d7e2c559b9709c17d9d6a0bf1c7e9
font_01_sfnt_off00011c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C43 10192 bytes
SHA-256: e21c950208a4942c4ccd80779bf65b244e6b54be44bc9dead6f33d8c9e1340db
font_02_sfnt_off00013345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13345 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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