Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b76285b7a33a97…

MALICIOUS

PDF

146.9 KB Created: 2021-08-02 09:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fdae597c2ce8f1ea312a3726d80169dc SHA-1: 2a93c5dc4d517a08166d87afb027640aa24d2380 SHA-256: 37b76285b7a33a9703a58310284d1da7739be98868955c06f4e1d11a8fe2ba67
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with several heuristics indicating a link farm hosted on compromised CMS uploads. The ML classifier also flagged this PDF as malicious. While no scripts were directly extracted, the structure and URL patterns suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9433

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://ph2020.org/FCKeditor/file/ferapag.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/06frsh6m8tkl132bf7fhlgop85/18495606729.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e86578501---66238818592.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609879d098333---95926924345.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160db8b6632781---neget.pdf
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/26146439861.pdf
    • http://tydafa.com/dafa/uploadfiles/20210617082206.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a777647705f---80347111377.pdf
    • http://ptaki.info/imgekoprojekty/files/52848759393.pdf
    • http://ccsl.asia/files/68276216930.pdf
    • http://air-ned.com/uploads/files/37029359649.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a60932e33b7---52362976610.pdf
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b61304b897---4694560064.pdf
    • http://probeg2000.ru/files/userfiles/files/petosodemiwulifakupibiko.pdf
    • http://anadarkogomezfamily.com/clients/7/76/76920377ef4e0cfe2c6e77079a05cbd4/File/nukubewinegugerupit.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2838cd3a22---2741608928.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ca0f04b93398489df438bdbf9efbd547/mujiwumovifip.pdf
    • http://lycee-elm.org/userfiles/file/mikuxino.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/198aa2cc7cc2fc14831cf7309b8050a5/7597874252.pdf
    • https://matrainagycsalados.hu/userfiles/file/dodibubapufusaxi.pdf
    • http://avandcie-automation.fr/ckfinder/userfiles/files/1686503145.pdf
    • https://basalyemek.com/ckfinder/userfiles/files/98616267213.pdf
    • https://delphin-restaurant.com/ckfinder/upload/files/liguwunoremudun.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/07e7675f4b2ebca84829a3866f4409f5/51046978298.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3637669ffe---vodugefivobozoremubebosa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=h+band+v07s+manual
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f886.bin
a4b5b2e16ef02425dde86ba8e211439cf4c2f36b3f4f5cd57b3efe0e1429e165
pdf-font-stream PDF embedded font (sfnt) at offset 0xF886 10336 bytes
font_01_sfnt_off00010fd1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD1 16792 bytes
font_02_sfnt_off000127df.bin
a1483844366f100e29c272a26fa3556fe6280359b3a17103861349925c23035b
pdf-font-stream PDF embedded font (sfnt) at offset 0x127DF 82296 bytes
font_03_sfnt_off0001fc35.bin
d91e97e475880d7141994b1964fc2d9bd0a9e5c9eeb508e5d0862de279812f94
pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC35 16876 bytes
font_04_sfnt_off000213a2.bin
95bfa757bdbc676fe1dcbec5603b26e4bd6f2a991b1a3527ccdbd74bcd491a35
pdf-font-stream PDF embedded font (sfnt) at offset 0x213A2 16288 bytes