Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da1ac3bb9868f2c…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 23:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aa44108aee1da62a90119edb4033afb4 SHA-1: 3595237610a3dcc4924845cda57bb7b103375974 SHA-256: 9da1ac3bb9868f2c56e49174eb981069d99b0438c4f7270ee8d58b40b58a5fcf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm, as indicated by multiple heuristics and the presence of numerous URLs. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution attempts, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/biremotaditafenevedege.pdf In PDF document text
    • http://panteres.com/files/files/legub.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/4515084654.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/61687755901.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/6061373872.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/kujototezatas.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/6c3d209bbfee35ee5b72ce70cbcf5c12/fipaxitosovetiboxidokova.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/52660794519.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/60050106923.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/lepubejidig.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/parimuvofoliguzip.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16141e5e5807f4---10293525222.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/vujuke.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/26399174490.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/fizunofiba.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/30200515982.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/raxemaxifer.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8618ad84a---jatugovapibizisonewu.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/wovuleg.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e7e1ab1d250d81d2c7c580f23fe00488/43626992731.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613eea88de9f8---wevabixafeper.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/dirajajewebabudigegis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=embed+all+fonts+in+pdfPDF 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_off0000d6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F2 18688 bytes
SHA-256: 41586df8cafda17c4e6ac52be348b17f6786934354784bbabcacbc569489a70d
font_01_sfnt_off00010752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10752 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F69 10684 bytes
SHA-256: d34c65967973962a79cab5632a534dc9dd77fac548afc24490fdea43b66d25e5

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