Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb264c62688713d0…

MALICIOUS

PDF

77.3 KB Created: 2021-09-04 18:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 57c590e8cbe5d9ebc702823333cb08cd SHA-1: bb762d1b815d299060de66d2a5a012c124a2ebb2 SHA-256: fb264c62688713d03acfd239236e1c1dc1888eb8f909920caea87540349d5db5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan distribution intent. The document body is unreadable, but the heuristics and URLs clearly point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://xz-brand.com/ckfinder/userfiles/files/83916774297.pdf In PDF document text
    • http://aa-nusd.jp/60886167654.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/binudibokes.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/14ommgo5p0msmfeshi515fsa2l/99980943162.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/gnh56478h4gvn56op2l7j19ll3/tijivofewusotukulabu.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/purudojukawogazodu.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/4km78noofijfq0pbmpil57cpe0/denugamuzunodot.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/38842a666cf0ccc5f00dcfa0ecfc9e17/dojolelagix.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/21058687153.pdfIn PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/fekuwaxebado.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/9fa83bf7dd810c6757ddbeab1416a33c/zilerexo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0503bed58---lujigexinonojefo.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/31845154782.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c690c373a---17086960548.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/55893373799.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160757aca1064a---89439706103.pdfIn PDF document text
    • https://anfauglir.com/images/file/40650532021.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/31758574194.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/59497319620.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f36c51493f---36968784453.pdfIn PDF document text
    • https://amblamy.ee/upload/file/fuxipefixexiruwevolafin.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2ae0a8743---wonenejimaterejeder.pdfPDF link annotation
    • https://seedomoretravel.com/files/files/kajikimuxemubojakoxum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=alfonso+reyes+obras+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_off0000c8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FD 18004 bytes
SHA-256: 19cc444984bafc710b82e32e3c6da575c251f3cabbeaafcea9991e511bbc513a
font_01_sfnt_off0000f7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BB 10536 bytes
SHA-256: 633ebb0e7770163ebe656a473beced8ad4f3653ca3c1cdcbe58f71a09ad74b56
font_02_sfnt_off00010fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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