Malicious PDF — malware analysis report

Static analysis result for SHA-256 49e7d92c3bc56304…

MALICIOUS

PDF

87.9 KB Created: 2021-07-18 01:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0d35b3a6f20f01603dcd181954de3de5 SHA-1: b98ac05fca68b449624af01ef8d68dfc203a616a SHA-256: 49e7d92c3bc5630440272fdab34008fd2d8d1fdc61d685bf326517102b970328
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure points to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b99fa0154b5---53680398411.pdf In PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099fe0ca359b---direzuxiduvegijomoxiweg.pdfIn PDF document text
    • https://birudongker.com/contents//files/95842411190.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/6be17badc180b7304c480e24a1f78644/zukopiva.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb4facf631---nanemawudibokirusodunato.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/53074530314.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e8a6e4a19---54886691968.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086b03577907---62837310935.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bb046d644---95189724072.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083cc65845c3---menofo.pdfIn PDF document text
    • https://noblacklist.pro/web/img/podborky/files/puzovikatifakorukijax.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/0b5659d400a85979225ff88319f7f188/21908196653.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/82876623373.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ae5ab2682---falosotefapasaremej.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/61234747022.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b88eab2305---79500383290.pdfIn PDF document text
    • http://grupophi.es/uploads/files/lugorudine.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/zajodifi.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3e2260b19---27923392774.pdfIn PDF document text
    • http://charivne.info/images/file/likanek.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///sisij.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/xusukewiduletomi.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/217721544.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb5910c797---midutinanozupizagadenesif.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2f8f86a36---dotuwininajoso.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16096b5f18940a---82077313766.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=passing+a+gall+stonePDF 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_off0000f7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCD 10184 bytes
SHA-256: 783f9efd665025553ae00592010ff58491c7cca6ea4df544c8df1d25d80e3505
font_02_sfnt_off000126b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B7 16840 bytes
SHA-256: b4406b44c6bb114ca42a546596d4e542e62e31a60e5edae2cd5d0cdc69174a4c

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