Malicious PDF — malware analysis report

Static analysis result for SHA-256 473c1d9b6d3cc0c3…

MALICIOUS

PDF

74.4 KB Created: 2021-09-02 05:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0ceefb78a9c89e23a14947911c11d3ac SHA-1: 593157fbdfce24e7b57d424cbf1210e687c804d3 SHA-256: 473c1d9b6d3cc0c3c841e5e136e333bf21bdbafe58033bc837443f63df1d26c8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting domains, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160fe081db6196---92206856138.pdf In PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/sizemitokifodorovivor.pdfIn PDF document text
    • https://olterus.info/contents//files/48759956500.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160931bda0aaa9---88350104805.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/9975836991.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bb3e7b506---92651944145.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210622_152410.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/47922696341.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092ee5f9a524---tapotaxenobikawix.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afcbfca2af---bodajetajanutexufiji.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/739ebd2065306c69ea3ae3b8b51978a1/finomolosivoziviv.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/57709028395.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/d69888665c52a89322b50e947e4db1f0/kasuvozuj.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/nusisimanumebenokepamunoz.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/pivatepisexef.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/jdk8mqtrfe8ifkmjqb5j7u2j0l/49917528102.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/jupadu.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7c97cf48a---mavewovixifurizowosa.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/7e8f399010575292c19851d800ce42a1/nezegepomeloz.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/11388675651.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4aaf923c1---2169496735.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/63212406337.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/8176714106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=fourier+series+solutions+of+partial+differential+equationsPDF 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_off0000bc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC15 10712 bytes
SHA-256: ae1af8bfaa9bc84e5e67bb28504eaa8617e3779934e0bc58869046014b48f293
font_01_sfnt_off0000d489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD489 17632 bytes
SHA-256: 96518b727b7d1c4fde796068a5637182286c5f8239cd8d3c3b8283fbaa09872e
font_02_sfnt_off00010230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10230 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1