Malicious PDF — malware analysis report

Static analysis result for SHA-256 74ddaa3d43594619…

MALICIOUS

PDF

86.5 KB Created: 2021-09-01 04:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4bd758f85d94035da25d24b9dd43f329 SHA-1: 085be66938bdd1aeffc9589c4f51b8a21c4d20e4 SHA-256: 74ddaa3d435946194bc2691c78f4fa310b98fa7f8f05f5a8c08ac35e94844c58
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are marked benign, point towards a pattern of redirecting users to potentially compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/5156d7b7319811bc70dd00c9c65949b4/girepitu.pdf In PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdd124ba75---69939677690.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/55869759894.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/49593401821.pdfIn PDF document text
    • http://sns.hu/_user/file/kasab.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/fogutomaxo.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/92cdb025f5151f1e58bd8c89286ea966/68474774301.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/a260ab726ffbb28d4c0c3823749b1fdf/37007382823.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/sigemizarixo.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/c5652061dc7ebf8fbb7f7bbe8090cb83/4721355738.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1625754019.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/sovarizidasotiwuwadijus.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/37643756921.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/56842309346.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/setabum.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/64283309192.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/40152471361.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/moziduzu.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/wuxegufowigor.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/17456544540.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d433d6061d---pakujufexaxizegus.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160e23c1cb7a52---63197089589.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/5906031454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=apower+free+screen+recorder+downloadPDF 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_off0000ed4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4C 17484 bytes
SHA-256: bb5c23c824bc56646afea6a5b6be98462c8e919e9557218f0340687cff6ef65e
font_01_sfnt_off00011aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA9 10488 bytes
SHA-256: 33053949c0972de171acd94a89f4cd41e2cec007834a3172ef0fec08db1b1ff3
font_02_sfnt_off000132bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1