Malicious PDF — malware analysis report

Static analysis result for SHA-256 019b75276878d4a2…

MALICIOUS

PDF

79.3 KB Created: 2021-09-06 09:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cfe83452dce1114acbb4cba1b977d1fb SHA-1: fb72e660ec8df2cd6bc9c2d81f9a8f6548aca403 SHA-256: 019b75276878d4a2ac1289e0b7fb4192f7ae5f3d9331b400405783819c15954c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://wastran.ru/uplcv?utm_term=mcsa+certification+dumps+free+download+pdf PDF link annotation
    • https://lawyerupsmart.com/tempimg/file/40382660283.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/74228260428.pdfIn PDF document text
    • http://learningkey.org/userfiles/tulutil.pdfIn PDF document text
    • http://tele-video.ru/upload/files/8848714333.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a30541a458---12191723580.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/62320693817.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/85239223708.pdfIn PDF document text
    • https://computerzone.pk/file/73947609351.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/66960685881.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/4odg06aprved3p3qv30n1eui2o/bewafijabewewiwaxesukud.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/kumoramabobub.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/k44hfh2d30e92h10qqdru5kbv9/14988659475.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608181a277d1f---tuzeririribefejimofivavo.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/labufisuxatigeximajaxew.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/rirovevofanoja.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/falemogijonosod.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/61665446354.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160787df560024---ripaduk.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/maletavelekuvozudobudili.pdfIn PDF document text
    • https://samowar.ch/upload/file/81675935479.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d43da23176---73765385070.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210526105624.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/dosunujenowok.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_off0000d0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F0 17116 bytes
SHA-256: d55905a39e61dad81bd8c7d2a0e916fb979a96965ba319fdf05010ecceb91fac
font_01_sfnt_off0000fd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD75 10960 bytes
SHA-256: c961b54bbb1389e81c0525c8430f30c98503c109f71ddc970b787f0859b74411
font_02_sfnt_off000116ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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