Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a116f5ebb7f627…

MALICIOUS

PDF

89.3 KB Created: 2021-09-02 03:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 77e1d155ac593d87ba49b75816f14900 SHA-1: f846663ea71a5cfdc7c47b86e8bdc728b8e7d0fd SHA-256: f1a116f5ebb7f627c575f2aa19be045f9b9b1178aed3ce9089a800e33352e0da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • 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.
  • 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://svx.su/ffile/file/33772783426.pdf In PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/94976201353.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/ae5c13043461ddab5282efbcce0287d5/lojekekijavome.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb5727abc6---wodumomama.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/53098944.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e4551ed41---81656140532.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/tedetoj.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/43598605760.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/sagamegusibujituzo.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/85129524304.pdfIn PDF document text
    • https://premiumtrade.ro/ckfinder/userfiles/files/64590336332.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098718ba8313---puwexegebag.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/551261099071c030c3eba9d4affe2efa/1063818884.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/97900153896.pdfIn PDF document text
    • http://feg.vn/uploads/files/turumugezudotudubijufi.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-29/20210629135827444520.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16099919341bb8---pivebofanoduwebu.pdfIn PDF document text
    • http://firegallery.ru/img/upload/gupujerevaparewejupuk.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160888e03d8a4f---12544933823.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610617038f98d---zeguj.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607354858c006---56768230564.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/e500f79e5d5b8b758be0fb2579deaf2c/91683635701.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/59208072695.pdfIn PDF document text
    • http://armanetti.com/images/71235913745.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/neemm6rc7o9b6d040ugeeogd57/tegoxeje.pdfIn PDF document text
    • http://learningkey.org/userfiles/jajoje.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fb3072335af---wusuvakonesozo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=what+is+dramatic+irony+in+macbethPDF 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_off0000f59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59C 18308 bytes
SHA-256: a89423f72d28578329b48035fdffef57bec9483fa8c0cc3a97b0c5a821fc0892
font_01_sfnt_off00012521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12521 10836 bytes
SHA-256: 67591188e4107ab5396a11027a41004a99b0459c31e479ef93831b5a66d5fb19
font_02_sfnt_off00013e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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