Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e0be18be723a920…

MALICIOUS

PDF

74.7 KB Created: 2021-09-28 09:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 490f530efcc0eb81383dce14180f93ac SHA-1: ab6c29ea569a3c0ca5032a6851009f62f32b50d3 SHA-256: 8e0be18be723a920438f156cdcdf5cb6037b3696443e2b24f9a126a641eb02d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a lure to download content, likely malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d079b9810b---91117003664.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614f19fd5b7dd---teliferifidaxajesutewuto.pdf
    • http://tnslib.tools/userfiles/files/55802473392.pdf
    • http://net-marketing.hu/images/files/xebanolesanutivimalegu.pdf
    • https://roarmysecurity.ro/mm/file/45381048344.pdf
    • http://telesson.net/_UploadFile/Images/file/55914792088.pdf
    • http://nakamurasangyou.jp/app/webroot/uploads/files/10994671403.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16143c6dd39375---45512488419.pdf
    • https://broadcasthub.com/ci/userfiles/files/41413134179.pdf
    • https://afmiletisim.com/resimler/files/45038051611.pdf
    • https://baglab.pl/galeria/file/xetapamifegaxasijaxikomi.pdf
    • http://ahcxdq.com/uploads/file/162154065282.pdf
    • http://monikaknoblochova.com/userfiles/file/gupodazebubamef.pdf
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/36770193583.pdf
    • http://lactopad.com/uploads/files/23445158831.pdf
    • https://tinhhoaxanh.vn/userfiles/file/49490581676.pdf
    • http://changrung.com/ckfinder/userfiles/files/pojufusejeleso.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/bc733c9dc0335b5d55ead527f00a24e7/31191992710.pdf
    • http://ros-audit.com/i/up/file/8553099668.pdf
    • http://pereplanirovkaoblast.ru/pict/file/40021822081.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16135e9b97e8fd---bafuvugaf.pdf
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/ralizevememuwutojawevo.pdf
    • https://aneri12.eu/res/file/7777243500.pdf
    • http://doingthing.com/downloads/blog/geust/files/salabaroferizoboda.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/is19ame49jsr2o61ecjb6vddvd/redojojoxiw.pdf
    • http://studiospazioambiente.it/userfiles/files/42397583807.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=latest+version+of+mobdro+for+firestick
    • 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_off0000ba6c.bin
ac0c41b373e0b6afd631da140c8944cc231dfeac33ecc1e57fe3bc58d20542b0
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6C 10848 bytes
font_01_sfnt_off0000d382.bin
7b5b29af4615d914b44fa7ddc13d11719752e771a31073173f8f606bb8513a09
pdf-font-stream PDF embedded font (sfnt) at offset 0xD382 19044 bytes
font_02_sfnt_off000104d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104D3 16792 bytes