Malicious PDF — malware analysis report

Static analysis result for SHA-256 b784f6dc94b45322…

MALICIOUS

PDF

74.0 KB Created: 2021-09-07 03:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5d5753b8d19bb6355555f70e2a0ce700 SHA-1: 481c287053d581c6ee49a763649a3eb23aaf04e5 SHA-256: b784f6dc94b453221b0a868f0ba3ce2fc32509660f51a7d8a1872e527412bd00
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded JavaScript stream and numerous URLs, many of which point to disposable hosting or compromised CMS uploads, forming a link farm. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.siscbolivia.com/admin/uploaded/fck/file/bafozobebasirivo.pdf In PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/begupuwerunudezoreziz.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/jamuvoginu.pdfIn PDF document text
    • http://premium-t.info/files/files/lumanapuxijuvelu.pdfIn PDF document text
    • https://semangkabiji.com/contents//files/wilamawedivesuk.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/45034189.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210828163632.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/giludasenidofotesabibonan.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/68353452264.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/rular.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/tugukafatetisufowumitepid.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/41286630067.pdfIn PDF document text
    • http://artospace.com/pics/file/64778300863.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/92828428215.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f1728ca4ef2---wepozirilibozometotaked.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/96501442237.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/1689770740.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e35d1a88bedc2e2347f31c468890afb2/34846025464.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/e08bafd1f8d9e09d840406e556f49a07/kubatojotamodevuw.pdfIn PDF document text
    • https://deepankarbasu.com/FCKeditor/file/76839057136.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086820fa2e40---36795133140.pdfIn PDF document text
    • http://skinanniversarymall.com/userfiles/file/61409164221.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/15466379531.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/98281703824.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/bobifef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=quorum+sensing+review+pdfPDF 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_off0000c1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C0 15552 bytes
SHA-256: 9e13e6bd8e3fdcb2743dfa0c209c0ffd1a7f1bca2b9eb15aa06b013437c02ad7
font_01_sfnt_off0000e944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE944 10844 bytes
SHA-256: e3fe321d8f92aac08b08bcfdaf5a01afd6afd4e63867d4dde6d2a60462786920
font_02_sfnt_off00010238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10238 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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