Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb847a40e45823e7…

MALICIOUS

PDF

81.9 KB Created: 2021-10-07 07:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d782bd90ce7f5be94ca6710fb36fdd5 SHA-1: 2d788d807d4a6d85a5a972e318db223a5186a3bf SHA-256: bb847a40e45823e7784045aefa9448bbbe0b3906f3fb66f8fcf05600009cf45a
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier strongly indicates maliciousness. The primary purpose appears to be a link farm, likely for SEO manipulation or to distribute further malicious content, rather than a direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://artgrafika.cz/userfiles/file/sawisusa.pdf
    • https://hargagila.com/uploads/image/files/33583083587.pdf
    • https://108pizza.pl/uploads/userfiles/files/magumitozu.pdf
    • https://dfkcnc.shopper-store.net/file/files/12696874439.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615d8bb0576dd---88127053681.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352e82f3477---didajakeguvaxoke.pdf
    • http://kbo.pl/ckfinder/userfiles/files/59002879949.pdf
    • https://steklo-shik.ru/userfiles/file/77122754584.pdf
    • https://nevjegyzek.eu/uploads/file/13889430588.pdf
    • http://tai-yang.tw/taiyang/upload/file/sosegeviredatisadoguveber.pdf
    • http://headlinesdinerla.com/uploads/files/kibasa.pdf
    • http://hgindustrial.eu/userfiles/files/mamedopirudex.pdf
    • https://tiemhoamo.com/data/dulieu/files/fejejodafogozijakiji.pdf
    • https://bomberosdenavarra.com/userfiles_nexo/files/wabojeruvurunojufitadiloj.pdf
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/82739332764.pdf
    • http://skupka23.ru/upload/m/biwuxupulumepelog.pdf
    • http://clanlogging.com/userfiles/file/wovapokukagifogatamu.pdf
    • http://fanghsin.com/uploads/files/202109061642186845.pdf
    • http://gabident.pl/local/userfiles/file/43856392251.pdf
    • https://dukra.sk/editor_uploads/files/21942231788.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e51e1189af---40446332648.pdf
    • http://myagreement.com/UserFiles/file/fudosaxuroviz.pdf
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/dijakugiwil.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfd96bb951---9992123591.pdf
    • https://pt-olympus.com/contents/files/xokirubujuwav.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=ring+of+fire+sun
    • 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_off0000dc47.bin
b2bd4b11cf020bff35b1fbb0a909a960a599eb61c86045c26c1446ea58f166bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC47 18020 bytes
font_01_sfnt_off00010adc.bin
25f7b0ec72dbe73d661978d7e1608ced51aa2eab9677e689eb0330cb1fc583f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADC 10228 bytes
font_02_sfnt_off000121f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121F1 16792 bytes

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