Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ad66d9b9714c69…

MALICIOUS

PDF

104.8 KB Created: 2021-07-25 18:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5bad3035a2ac702072b9f1a2d01cac2c SHA-1: 28cf2ef5530a09b3ddb2f1f7c80b8b3228c721a3 SHA-256: 10ad66d9b9714c694f400c919cb94a5f88d57eeaefd2bbad336fd7d93cb95679
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised CMS upload locations, likely for phishing or malware delivery. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

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://associazionedynamica.it/uploads/file/45156276517.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/f0itjtp5vq8uhirt6ikq2ne5or/nitisutinira.pdf
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/614cf2fe09c5972dad91ba8d6c762bbb/lonaxikekusisopafobut.pdf
    • http://gerd-pollak.de/userfiles/file/38692378250.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b86e83416---nilaz.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/9878b1ef0f7c59fb55ea33b59403eb4d/titurabajesa.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/tlo8rv2cj8shfurkvkhpmuuf3q/9964556982.pdf
    • https://burstallconrad.com/editor_files/file/pedukuluwosavagoxas.pdf
    • https://bancodevida.com/bancodevida/admin/images/image/file/xopojomivawaxexo.pdf
    • https://marblobathware.ph/app/webroot/img/files/65026026410.pdf
    • http://automsystem.com/UploadFile/file/20210507204703701.pdf
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/12651363813.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0182e873---kusozaz.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/ed60bc93d165fd369123ab1692e3eb2c/88255651204.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/camv7814k0nhunj9fm0e0978m6/11543916113.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca86e83db4---rovirimo.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085bb9a98877---30362996575.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a3413f4fe---dixetin.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a37fdffd5---pojafenadivuvozezi.pdf
    • https://pypconsultores.mx/userfiles/file/silagibupinupawijuteleda.pdf
    • http://sansboundaries.com/clients/f/fd/fde0d4b6b324343791c5f0705b221951/File/benalunujotiwulizo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=brahmacharya+in+english
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012f7f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7F 16792 bytes
font_01_sfnt_off00014796.bin
e1c2a6bd4e43a993403441972f279c4c79290c0cb4d464f97f0c237fd5685724
pdf-font-stream PDF embedded font (sfnt) at offset 0x14796 10624 bytes
font_02_sfnt_off00015fb2.bin
58faaf66582171fed4462cda717e57b792c6f37d39f3489295a8a13b790c053c
pdf-font-stream PDF embedded font (sfnt) at offset 0x15FB2 21036 bytes