Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ad37aa71d2a4d8a…

MALICIOUS

PDF

87.7 KB Created: 2021-07-02 16:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 817114ead580f19225d0ab751754a089 SHA-1: 862c880c390a33d1d50f1a4a06bcb207ab7d6248 SHA-256: 7ad37aa71d2a4d8a95f585c716261a90ba25264ea8fbbb86749dafae1f7700e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL analysis point towards a phishing attack leveraging compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0dd75305e---11537225128.pdf In PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d112f72ae6---62589313051.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/56048969429.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/wadarovij.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/b994bf73f6eabc577d935719f1bbc6b3/fijamazadasiginidev.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/rasekesoraxumeluronefexu.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a1b31734a---1092028585.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/vafonepipagubixizal.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b77813a389c---bezamesuwijuxa.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/285c581bfee90ab50552ca11e00d067f/duwufuburazafojofigabap.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/i06vlcnq7bdd6l7tjf9i7q27a3/43900632736.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/9b87d3eda4539a04cc7617869ac44d35/79927026566.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/92b449f3be343615475c522f06824227/55561074273.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/caee85eaba1d837a188b9a0b80573cfd/83934958103.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16095e2b2a69e3---31349691789.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/e0hgdkrjqk351upg9s2ahjh7c3/40115318763.pdfIn PDF document text
    • http://iberia-ex.com/images/blog//file/18124352395.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/ej3hvb1f9luftb4s4jd14nnje3/junazavokokere.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/wuduvake.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/figegajidosewitesitawol.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/nineregol.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/82898018099.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb0086817d---60135057158.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=pemphigus+in+dogs+pawsPDF 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_off0000f5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC5 10784 bytes
SHA-256: 770ab0559b9ff28477c1708604fea5568f755ac60a623f8518cafc33a1311c04
font_02_sfnt_off00012635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12635 16872 bytes
SHA-256: 32b7c4d82c3100e5935e36b4a2405ec4079d2a6d3d318bd259317ba670d9c039

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