Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb54d73172b95e1…

MALICIOUS

PDF

85.0 KB Created: 2021-09-14 08:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10e8246cf0a5a41d0775a3d2adae468f SHA-1: 15ad5559153a455e2bae08731f396efab7a47972 SHA-256: 8bb54d73172b95e1539405314e403172d60c32c26aef491e94c802114e9996d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with attempts to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://allytemp.ru/uplcv?utm_term=techy+android+apps
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/wusexawaxorole.pdf
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62765269171.pdf
    • http://shrlie.com/upload_fck/file/2021-9-14/20210914052202448730.pdf
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/rifoxilibigu.pdf
    • https://www.pharmawell.eu/ckfinder/userfiles/files/22211979423.pdf
    • https://wheelmartthailand.com/image/upload/File/dajebawovubukokeza.pdf
    • https://betenenergy.com/sites/default/files/file/94047536794.pdf
    • http://ediliziaunoaventi.com/userfiles/files/93603621846.pdf
    • https://uleshuzatabc.hu/files/file/20691852987.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/34471a1b31ebf5b7cb880a19f15caac6/55943870085.pdf
    • https://varida-tech.com/ckfinder/userfiles/files/72840797172.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecd48eb6e8---19724581076.pdf
    • https://alhasooncorp.com/Files/files/damasuzomiwopuvorefew.pdf
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/35454414913.pdf
    • https://imihwa.com/uploads/image/20210910/files/20210910050723.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134530eb8707---12581894945.pdf
    • http://hyeminshop.com/DATA/files/jidabubupurebuboliw.pdf
    • https://sandp-engineering.com/ckfinder/userfiles/files/7958181094.pdf
    • https://xyoaa.org/sites/default/files/files/kokinox.pdf
    • http://julianina.dk/upload/file/93924581234.pdf
    • http://bjsixiang.com/jingkelun/userfiles/files/20210907163208.pdf
    • http://vatlieulamnha.com/media/ftp/file/kiwapisejobijirilunenek.pdf
    • https://profitaler.com/UserFiles/file/23084900820.pdf
    • https://agri-mal.pl/userfiles/file/kizupur.pdf
    • https://toppelletmachine.com/d/files/89034904783.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_off0000e7f0.bin
d20fb676b3ed250fe2ffe6eb081e0671e118ea9e287002de1f8e157b12d2e113
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F0 10544 bytes
font_01_sfnt_off0000ffe1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE1 16792 bytes
font_02_sfnt_off000117f3.bin
010ab80c89b9d2f81fb225132c79c52ac118ba9b4ffcc9fa460822b1dbca5173
pdf-font-stream PDF embedded font (sfnt) at offset 0x117F3 18056 bytes