Malicious PDF — malware analysis report

Static analysis result for SHA-256 3003e0420240cc31…

MALICIOUS

PDF

86.1 KB Created: 2021-09-16 07:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 402f03b18f8926351c4f8154bba4df74 SHA-1: 1ec1a650f00b74f9871cb3de291f72fd5a9b4fb6 SHA-256: 3003e0420240cc3160e20894270208acef4c3189ba006d351beb1a0989383163
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The presence of embedded JavaScript and a link farm pointing to other PDF files suggests an attempt to lure users into downloading further malicious content or visiting phishing sites. The URLs extracted, particularly those hosted on compromised CMS uploads, reinforce the phishing and malicious content distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chothuethietbi.info/img/files/vibemiraxafirewe.pdf In PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/poriwam.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/tebibek.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/cdcc02421571126e639991a557751a8b/mizagixos.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161307b6242998---puvijafabaxuruwewa.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/fovovakikadixufajor.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/mipedoxotunifu.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/50556862199.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/92441511294.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/neq64oqsljufs9u1e5i0sq4cps/21023432377.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/75997101345.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/xixawalinu.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/7246340948.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/29430830768.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/5964054213.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67102568411.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/monow.pdfIn PDF document text
    • http://willajarmar.pl/userfiles/file/28610286905.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16136ebb00d7b8---digelodedowogowodaja.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/14658912286.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/dumupedakezofuvafigevira.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/titarete.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/pipotaninirapumetefixenug.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/42858423381.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/62533082835.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=miracast+disabled+android+8PDF 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_off0000ea37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001024e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024E 10704 bytes
SHA-256: 00cab8180b301a545106bd1947f3ad26847941a2e266132091459852187098de
font_02_sfnt_off00011af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF8 18208 bytes
SHA-256: 5428b397b705f85f1bbe96d56b645012db38c1076bda257dad0ec97505adfeb0

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