Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e24e325af35b2d…

MALICIOUS

PDF

77.7 KB Created: 2021-09-17 06:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ca8b898648367f4355ae1ef8a9adbff2 SHA-1: 71dbdcb12006d5663b8827b56c749265273c7913 SHA-256: 33e24e325af35b2d3eb3d27417597fc0c550683fb0341742ef310c2e449243c2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the high number of external links and the nature of the hosting point towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://chcial.ru/uplcv?utm_term=best+funny+shayari+on+love PDF link annotation
    • http://kiddeefire.com/media/userfiles/files/xajudumunuzafijisixir.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/teragotugisumafag.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417dba9f89d---95558691939.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/nejetatujof.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/nozal.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/ditotulofiresojedavi.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/minuparirefebanuzuzo.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/44719624355.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/ab980ce3992569d8569f11439859b9b5/63304054234.pdfIn PDF document text
    • http://byecook.com/ckupload/files/wufitopupemawibimiru.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/96732254486.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/newedofemir.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/jidesebep.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/8bf50339d8da3995819e80b442a788f6/mewafa.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/11543869228.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/fanasoxotatumugokowadujaz.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/71331328430.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/41753303794.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/30578114372.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/88310064940.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/77283417936.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/dobenenugebesuvavomujofok.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/97011185319.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/mujativu.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/97905838523.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB927 10644 bytes
SHA-256: f88635dadfbf9e79a9f1f7b994d89a635afd95da93487317458a58da0d45e76b
font_01_sfnt_off0000d18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18D 21752 bytes
SHA-256: c97b00141904e40557ecbf8e0e4ad287230340becadb4352f6708f8f6b5e1ba3
font_02_sfnt_off00010813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10813 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12020 1936 bytes
SHA-256: 9aeb06937c81a5c56cf99af8deab830259c8e7bb488e779e8e638c33337cf583