Malicious PDF — malware analysis report

Static analysis result for SHA-256 320fc65d5a7c4cc7…

MALICIOUS

PDF

142.9 KB Created: 2021-06-30 10:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32303a3d674c09d0d13fb512b89916e4 SHA-1: 84d2b814536c71507910bccea5e60a1d93c53b52 SHA-256: 320fc65d5a7c4cc7b2aecea8ef2da70480542bb692fe514e52389713cbb2566e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting sites. These links are likely intended to redirect users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://sealordhotels.com/ckfinder/userfiles/files/soruguwonarowegub.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac826889e88---62231842867.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ce0338b1844---32375758685.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/7b04hdb0c53h5v5qgu41hr5j0b/60993244002.pdf
    • http://guoyangmoju.com/userfiles/files/41154473128.pdf
    • http://asfalon.com/__files/file/rejoda.pdf
    • https://diaspoassur.com/wp-content/plugins/super-forms/uploads/php/files/0cea6c5a1f581cb8ef92a5459bc55345/20468612889.pdf
    • http://groupkaishan.com/d/files/1251935788.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16088627fd697f---tagepekovukuvizivirul.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf841c7ddb---98368278835.pdf
    • http://botosani.ro/img/uploads/file/fojoselixenex.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/tfqm8c5j77ejmbhtsijjuqtfu7/72224416003.pdf
    • http://altinay-law.com/images/file/73955261613.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/12f3d5c7475b477b3fe99f0cb3459886/22366379052.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6ed8db1af---sixegetulovezutogoken.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/59619e9296908dd053592fb959da4654/34028323731.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/3aaf4090eefe5344978ffb99ef757be2/vikimuzivoxizage.pdf
    • http://dioceseofniranam.org/userfiles/file/95657414921.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721a40a1819---lixasudefijopadituxalupaj.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/a419a0a1fd55bce53ee24797c3e1f620/kewesusirizawokawun.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/46936511402.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/025767aec4651984f3843a4928edc236/bisulimitodepabisomoluj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=anti+oxidation+meaning
    • 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_off0001c9d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C9D3 16792 bytes
font_01_sfnt_off0001e1e5.bin
d857aa6af926cfd4bfb9442c35fdb1ac72d9c2e5dea192e7f332296bce6ff728
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E1E5 20616 bytes
font_02_sfnt_off00021704.bin
062dafbe256aa32aa67c9ee65bc99664c761ced8398827bbc7837e306b3826f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x21704 10360 bytes