Malicious PDF — malware analysis report

Static analysis result for SHA-256 654e6719d01484d3…

MALICIOUS

PDF

83.8 KB Created: 2021-07-01 23:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e907229ea6e4408d3f4b202b1df904e3 SHA-1: c4ef4c031de5a938c2871d57a33fccfe43480f86 SHA-256: 654e6719d01484d39a8730d587c55ec6dcc6c3a00ce0dc2949aca2deb06fe659
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/o5al8emt619889n8q06pohbt36/xidixapu.pdf
    • http://angeladaniel.eu/uploads/files/nakosapopebo.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805f3c32619---97557968089.pdf
    • http://ypperfect.com/ckfinder/userfiles/files/91483634922.pdf
    • https://bselink.com/userfiles/file/66425018376.pdf
    • http://uforoi.com/app/webroot/uploads/files/22958434421.pdf
    • https://bomberosdenavarra.com/userfiles_nexo/files/buxaf.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/abb8466912472b604d061a3119ce9426/sixafokabag.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb33eb4432---94903853645.pdf
    • http://petraifevronii.ru/ckfinder/userfiles/files/mebigagukaz.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/306b12df054c82684299bc0aa9fbb276/bevuzonuginuwizomabow.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b254deaeca9---96344109571.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a81e0a31b---26178111701.pdf
    • http://hongshengfish.com/uploadfiles/2021051706502178224.pdf
    • http://grupophi.es/uploads/files/genewonusifubo.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3a37262af---83693603569.pdf
    • http://sns.hu/_user/file/61227591918.pdf
    • https://europartner2.pl/uploads/87234886657.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160784577e2964---nebudu.pdf
    • http://sciattella.net/images/file/gemuvomufidasatefidaloluj.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/ad3d5df434f05f859d18f485e58d959f/6435183679.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/r62pbqu4ioctc43gpkvdth0t1p/femugejoriw.pdf
    • http://anhuifan.com/upload_fck/file/2021-4-30/20210430043315430220.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ha3qv1t2qch701tt9cs5v6gl38/jidazibepoxofakadibofoju.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca792b75d2---30183616384.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=sql+absolute+value
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce35.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE35 16792 bytes
font_01_sfnt_off0000e64c.bin
c5f48ab7123407a4db9b31d13ca7c4492f9fc2854c8fb8a320306477585a2293
pdf-font-stream PDF embedded font (sfnt) at offset 0xE64C 10332 bytes
font_02_sfnt_off0000fdcf.bin
77c4351f349e555c6a51d531a8b8a3054cc84866495d80d6b973408906e09d77
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCF 17692 bytes
font_03_sfnt_off00012c9b.bin
9dc74535a6692f4260f0355970fcc7bc2a5c5af40b851cc3ce6f07945a46146e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9B 16076 bytes