Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8e3b1aee84e896…

MALICIOUS

PDF

85.3 KB Created: 2021-08-20 11:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2473d20d3bce060e3fc141cf90584e9b SHA-1: d440984eb3cdcf8fc4366edaf6aedd8377443650 SHA-256: 5d8e3b1aee84e896f5b5cc715b4d1ceb40bbc38a98b74e103c9c562ff58c363c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to compromised CMS uploads and disposable hosting, likely to lure users to phishing or malware sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit user interaction via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=what+is+the+main+idea+of+mercantilism PDF link annotation
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/71f4772d6ee454adca1500015c94e09d/75166032449.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/bumogolokibaxokej.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610f0d1dd4b63---jonalejegovezelulo.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/2cbb164e9cf0d577391806a10a91730e/nejarafemariwesokuwaw.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/8c2dbe48c5edd28421e781b378bb134e/dutufumev.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608550f1b3dc9---puxelosutal.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/bomikavodubodidegezide.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/59193964548.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609c74abc49bf---32356188896.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de1788decc5---mevabemorufiduziditegove.pdfIn PDF document text
    • https://isleo.com/i_photos/file/53005674291.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/87714158e70c65296ecf3b612550273a/walivoxatavanowa.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608124881f0db---tedijovanelolofuka.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a27504eba65---tutiferi.pdfIn PDF document text
    • http://skupka54.ru/upload/m/66158686759.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/c71cd2cc243063453d4a6812efb69c08.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e694cb1a5---xudulilixi.pdfIn PDF document text
    • http://skncn.com/u/files/pizisa.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a11d6d2677---vawujanufejeviru.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/66139735429.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///60438488579.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d17ac9ac2---43388879316.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_off0000ec9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9D 16444 bytes
SHA-256: 10c82086cb945a9d8acea89d5bddcf4de86475d6cdbe9eeb531723cae6bb06d5
font_01_sfnt_off000116a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A1 10732 bytes
SHA-256: 21b2bde754fad261ef90bfda5dbf6cff468637fa4d5a5e8ba3634e427d519d14
font_02_sfnt_off00012f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.