Malicious PDF — malware analysis report

Static analysis result for SHA-256 d68d87b9e58fc9c3…

MALICIOUS

PDF

86.5 KB Created: 2021-09-04 23:27:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7cdf72c6d863e05dfa9621d7da06e587 SHA-1: 292dc311c97279c9ae1aa408d2253e195f9aa1a3 SHA-256: d68d87b9e58fc9c379aa3e4d1cc9bc85455f49fdc9af6f451fd7d146ea76213d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to compromised WordPress uploads and disposable hosting domains, indicating a likely SEO manipulation or phishing campaign. ClamAV detection and ML classification strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, but the presence of external URIs and link farm heuristics are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oishisushigd.com/uploads/files/pikunalofekolaju.pdf In PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/wesivaluzan.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c33ac2ad20b---44119588217.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4f7adc9888---nujazinuzizezomumafukus.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/18291301706.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/sizoguku.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/43d79f7841ad76150a043251c4cf01e7/43134548750.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608744b24e241---nivizupipezaginejor.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/feaff7e7e1b2a2932c162ef9674bc965/taxaredozuke.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/839f093457a94378ebb48846aec9b7e4/40428331484.pdfIn PDF document text
    • https://epos.nu/ckfinder/userfiles/files/xarukadovi.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/1112405018.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/12735828622.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/9b437d147d42d8e9eb7e3ad2fc8f3dfa/lejirubebebulo.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/n67gliasm1usrij0h8hh78v4an/92795620608.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/sajaji.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/44903706567.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/vkkt1tbi80d5t60v61ht8vmi1g/luvadojofol.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d840e8fef---61034380366.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/uihignbtqib971otpema36674d/56405556530.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/52048327643.pdfIn PDF document text
    • https://www.dars.bg/ckfinder/userfiles/files/jazotumop.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/garod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=structural+steel+design+by+dit+gillesania+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_off0000ec3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3B 17784 bytes
SHA-256: 94c1360fcbdbe7408cff985637358975abad0b1450dfe51f80432c9a41a18cc0
font_01_sfnt_off00011aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA1 11104 bytes
SHA-256: da39e96552304a512125ed5cb8036278c8f3b2324d550779cecfbd4f02baf7ef
font_02_sfnt_off0001342e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1342E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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