Malicious PDF — malware analysis report

Static analysis result for SHA-256 4345fac732de05da…

MALICIOUS

PDF

89.6 KB Created: 2021-09-19 22:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e42ff4e22e156d4c69527a58212d10b SHA-1: 9b2d49b73c5548df9bb00a9845cddb52ff93cd87 SHA-256: 4345fac732de05dae215e2220d52713cf99adbbf8c8cd5470c9ade4a1923bcdf
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that function as a link farm, directing users to various external sites. Several of these URLs point to compromised CMS upload directories or domains that appear to be disposable, suggesting a tactic to obscure the true destination or leverage potentially malicious hosting. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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 https://infrive.ru/uplcv?utm_term=best+offline+shooting+games+for+android
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/14341331289.pdf
    • http://cathugo.de/res/wysiwyg/file/27630074747.pdf
    • http://iiiemjobs.com/FCK_Editor_Images/files/25030224896.pdf
    • http://marcth.pl/media/fck/file/kirogedujemotirejim.pdf
    • http://bunny888.com/ckfinder/userfiles/files/89326858000.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1aad7e87a---70750877281.pdf
    • https://tecnicadovolante.com/images/file/52961755405.pdf
    • https://best-of-geldanlagen.de/userfiles/file/89759966727.pdf
    • https://himalmanpower.com/ckfinder/userfiles/files/67482881349.pdf
    • http://hawaii-resort.info/images/blog/file/tevonuwamotegefevogol.pdf
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/rokimurid.pdf
    • https://mwasafat.com/uploads/files/77457252450.pdf
    • http://cukiernia.eu/upload/files/80720841210.pdf
    • https://vetamblj.si/ckfinder/userfiles/files/54156592308.pdf
    • http://csc020.com/userfiles/file/20210907235732_5hf63e.pdf
    • http://oldadmin.k12cart.com/media/files/36638678537.pdf
    • http://studiotecnicodavico.eu/userfiles/files/33780498819.pdf
    • http://drairtools.com/ckfinder/userfiles/files/xidivotilojezadenarugit.pdf
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/77781790983.pdf
    • http://tythb.com/uploadfile/files/89526225823.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/rphdsebp745s83nq2achir920e/xulidinulixenixumepudur.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/ef9f9513dff6cbd9af9ef6ce86d6451e/97700346935.pdf
    • http://agro-norwa.pl/userfiles/file/31239422473.pdf
    • http://urs-certification.com/gais/image/file/dodifubimuxidap.pdf
    • 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_off0000fa9c.bin
6de8d1d40df5456fad9ab6d25092de86d820d829827d0ca4f270c38c79972e2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9C 10852 bytes
font_01_sfnt_off0001133f.bin
c90c96a6ecafe4533586eda7eef6008495fb212317cb58550036a7f847d22fd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1133F 17412 bytes
font_02_sfnt_off00014018.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14018 16792 bytes

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