Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b14e195690004d…

MALICIOUS

PDF

76.8 KB Created: 2021-09-04 17:35:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3fbf212e7019a36a7887c73e88e1538b SHA-1: 6b8f07d4b19664b4d916a4a31400c51859735b74 SHA-256: 41b14e195690004d4f6193ad3a1b45d8b87ae0f833b00a7313897f773b65c107
104 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination. The ML classifier strongly indicated maliciousness, and the combination of these factors points to a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://garglob.ru/uplcv?utm_term=suzuki+book+2+cello+pdf PDF link annotation
    • https://himalayanthailand.com/image/upload/File/dizonosezewo.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f6643929d---70003614344.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/ve9ir6uec96d1r3upu6l3nne71/gelukakilud.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/51413123857.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/lozeniwulatufesim.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/padupogovimodiwezulejoxel.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/vcj2cdoqtfkjljg5kdh4dmqo8b/zuxokoxutawevuxonudolel.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/9clc03rr8kodtak5bp69dfvsr1/xiwukimubenenol.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/80914041303.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/cbf044d52b1425ae87e704bc77a30a48/74754613169.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609d30690eb30---29442943561.pdfIn PDF document text
    • http://tapestry.cz/images/file/files/debiwodofojebepumowevoraz.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/12240349118.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/sawegemawonerafisid.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdb55706c3---19025023258.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2ab247263---safaje.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/28608816561.pdfIn PDF document text
    • https://campermagazine.tv/public/file/jajukixopet.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210820_050516.pdfIn PDF document text
    • https://areicon.com/images/file/50240753675.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/mubotebap.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2189341e54---vekiduxasufimaxudawoka.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/4dedd462af43573ff9b151d8b53a82d1/11794400165.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/6ba0a2b255767e4fa157fe687fc61bc0/gudopuvopab.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/4462c79ae2a7794fa2835ea3b1e503ba/32697345433.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_off0000c88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A6 10568 bytes
SHA-256: 9271f28bffdd5aee736435116675998090e8efc8552235358af71c076dd428e4
font_02_sfnt_off0000f8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B3 17336 bytes
SHA-256: c397e15724d312d6a4d9316ec78a077739e17e5c82d89da48c34575692904c75

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