Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4373bb902aecf32…

MALICIOUS

PDF

86.2 KB Created: 2021-09-09 06:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 02444f707ed3ff16b9964a958b63678f SHA-1: 42076403c1657f5a68ba737e8a51211d8e393b19 SHA-256: a4373bb902aecf32becc35a051e627051b0ac1f0794b6c6421871aa95d6315b7
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs that form a link farm. These links predominantly point to compromised WordPress sites, suggesting a tactic to disguise malicious links as legitimate content. The ML classifier strongly indicated maliciousness, and the presence of JavaScript points to potential exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=ingress+on+android PDF link annotation
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/b8b3035f37bb5ecdcd1f6f2a60967f79/39907459707.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/jupuzidisofodetixigugaz.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613632ac6f7fc---lipuzilajimuv.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/pezilosakanejomiromad.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/ligaviwibu.pdfIn PDF document text
    • https://estoniapools.com/contents/files/79722650688.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/sonok.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/segudojanatetiperugafuzo.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/f204800ba7407df3de073d4503d003b9/72052527945.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/95575265580.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/23747730796.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/kumizopixuma.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/sifalajukuduranuv.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/vujezavotixek.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/97373168257.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16134406a71ba9---xevukozoposopibeg.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/pufutamog.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/muredotedusevuxoxuripob.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/25879776294.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/51483887613.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/bolalatexirejupavufaseva.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/jijeninufarutademuwo.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/053581ee3f4904ccf2a9f9617b81e53a/25008504533.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/lakutanizakaseja.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210909075044.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEB 18828 bytes
SHA-256: 9f3928561354b9e4b0dc79b0eb2886f2fd66e1fcf8dc724a7dd7fcc52f6e0d35
font_01_sfnt_off00011c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13472 10232 bytes
SHA-256: 12921762f16392e876732a331a603b2a09ff6eee1fd2d2502187563060f62dcb

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