Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8e3010554b2f6a4…

MALICIOUS

PDF

78.4 KB Created: 2021-05-23 17:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76b33492c3eb01753d641cfa13795076 SHA-1: 38cb585819c162a1af88791a133a2aa120049700 SHA-256: b8e3010554b2f6a46afcfee7d9d57d6ad14bbae30cbf2abd44a71ff8411aee28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/536653e22ea386b55cba88b8efb109e6/49418314927.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf79ca2e3e---wirer.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/t8rpt67mn8r3lcfvk40g2qist3/motekelakepowopiru.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16089c728b95ba---8138664152.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/b16toeqf8bor8imoj3babgcdr3/70191946144.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/a0de129cdb1ef9e839df48d042aa55ea/61196719474.pdf
    • http://christschoolblr.in/userfiles/file/xerotefewagomab.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d331bdb45388d37e3c109ff87ecff59e/46353589474.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/fsupamqm5drvik9rtuofgg33ng/78356174493.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608301e1759d1---notuzaxiwefatape.pdf
    • http://aisef.org/uploads/userfiles/file/file/82076468416.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/k260gu72v5aj30tmvvca536be6/repalumiranidopu.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aac463432e---71203818980.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/f3t9p3fpvq75i5kpcf4jldgoog/malaxemojem.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/d62c836966871f36e60d14994d33cd38/90537611436.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/74kc4h88b6fasop29jpr32nate/junofewujafejeverivig.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/p8a3mnc99u7tnptmpl5enodfpn/jaxonof.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c064137a77---jidejaniv.pdf
    • https://ebooksweb.net/files/file/wuluxavupelopikum.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=samsung+galaxy+s4+data+recovery+software+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f31e.bin
5f505f5a1b9ba3ef2d53b273b55c36aafc5239fa6eaa53d4e4fef4c205ae3ddd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF31E 5856 bytes
font_01_sfnt_off00010718.bin
7c83be7268bfac480f6f774e232c3b74d8def0be5ffa07a8c1d8936a1ee2c4b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10718 10812 bytes