Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c1588170535185a…

MALICIOUS

PDF

86.6 KB Created: 2021-06-28 10:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2820de63ea3440347cefc4d0fdd8474e SHA-1: 61d0662c27dc3bbf459040d5f0203c09fea3ffaf SHA-256: 9c1588170535185a3c7a912682de13d0637da3039c93413fad7810a872f2bebc
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to other PDF files hosted on various domains, many of which appear to be compromised CMS upload directories. This suggests a link farm or redirection strategy, likely intended to manipulate search engine rankings or distribute further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://mygiftltd.com/userfiles/file/30937995077.pdf In PDF document text
    • https://bestofbucerias.com/upload/file/11282159928.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/xufetonake.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/ed3ec6a8e3cf7c49c90e36fcd763dcde/vagepebegaragavofijeto.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/41651366975.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083797e37a07---bafevig.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/95261138602.pdfIn PDF document text
    • http://bio86.fr/fichiers/gobiwuponif.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/kusezipabapalopus.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/6d1b7e767ccb5609ed5ae8a87b7b7090/dojopanupobawom.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf5885ae75---mosepodofunifabirep.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072442ddf0ec---dajamudepafinetajaw.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/08e5c35e74df4ee37674148434e7ebbc/velowawosuzezamilad.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740062a28d4---76251460216.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c89d3e9bd5f---73548225040.pdfIn PDF document text
    • http://waterreducer.cn/d/files/fotodovi.pdfIn PDF document text
    • https://ocbond.org/userfiles/files/15380376656.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/281459e6b2a5d34e365771bf1fc5073b/garitavobibunetikoj.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/zoxulovopelobu.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/e75e733217dce21f6e83603ce45e0559/nozojamusojojekapir.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/86486411743.pdfIn PDF document text
    • http://stylekd.ru/files/nuralawofapivaviboxi.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/1757513615.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/52f864ec027244d489ba814f72d1b895/10882127002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=reheat+rankine+cycle+problems+with+solutionsPDF 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_off0000eadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADC 18216 bytes
SHA-256: cd5b1e7424c7176d0899a4aeb3bb75810dcf8b92ec15c0b7797adc92d170aa8a
font_01_sfnt_off00011ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CA 11216 bytes
SHA-256: e33a41f57bea38f6261aa9b04c3306727dd002d439775495b4391009be1e4e01

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