Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa845dd68783f0a5…

MALICIOUS

PDF

83.4 KB Created: 2021-09-03 08:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4cd1618a195405cedb6543573e74e338 SHA-1: 21090b3e72550068dc48879f94c8a676e4e15293 SHA-256: fa845dd68783f0a55fe719f9869f3f7abb140b22ce1381e065cbe7dd73d6406b
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/p9pamn0tdhkv1nivugkhpp6287/39374682493.pdf
    • http://riversreunion.org/clients/8699/File/66207986069.pdf
    • https://behbehaniprojects.com/uploads/files/voronuv.pdf
    • https://tylbm.com/Upload/ckeditor/files/nezixubutadodaxewusuwa.pdf
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/lesajokisabavalulusek.pdf
    • http://studiotecnicoarduini.eu/userfiles/files/biwebilamagipaxaropike.pdf
    • http://peknanevesta.sk/media/file/viripudovikabat.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/4ee59c6d4919672a132ada00200c5b74/zulunilinevitikoliza.pdf
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/84833013386.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/604754a344262195846db5d2cdbe20b0/rivegonazalufabogaxufe.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ae3263fd3---norijepibibi.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318cf495a90---73276874141.pdf
    • http://nbc.ua/design/pic/file/niwed.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/947ac471b0862c7f50eb5fdab6a96124/kosorugu.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/40866498631.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608390d5543df---xofifagajegapisu.pdf
    • http://pc75.net/upfiles/file/1625775854.pdf
    • http://zhatuogz.com/uploadfile/file/zisotaposapepazeriva.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe29b14076---mapovebuguruvago.pdf
    • https://quatden.vn/webroot/img/files/dosafeguropuwumula.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a8d39ac8e---31038594050.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/cd0b84ebc01d09d2f0a0d2a5219df81b/taludifipunasojajagigoxe.pdf
    • https://immo-cjeanpaul.lu/userfiles/files/kexekirababiwodinutosesam.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/b54ubsi8v9f7vljc824im6boup/14070550542.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=guion+teatral+de+hansel+y+gretel+pdf
    • 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_off0000dc01.bin
4fc30c9d0f4d70c89e2ef1035a8d28653d22e30e32fa7f24ee76aad8a0675b42
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC01 11028 bytes
font_01_sfnt_off0000f571.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF571 16792 bytes
font_02_sfnt_off00010d83.bin
c9de9a3ec33fe750eb67627b265b552c8b319bf843ce7e0564431b4baa1dbf63
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D83 19352 bytes