Malicious PDF — malware analysis report

Static analysis result for SHA-256 861918320efd813b…

MALICIOUS

PDF

161.3 KB Created: 2021-06-28 11:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ade7500f14c6a6fee4759beb1ec4c7d SHA-1: 2d7dceda2da254947208fc1ce997b4614d8a87fb SHA-256: 861918320efd813b31c5d6e19fa57a0220332264d29cc22809f269ace4a11a03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF contains a link farm hosted on compromised CMS upload storage, indicating a likely phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as Pdf.Phishing.Trojan. No scripts were extracted, but the presence of multiple URLs pointing to potentially compromised sites is a significant indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9107

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.tif.cn/wp-content/plugins/super-forms/uploads/php/files/chsb5n4gt11tan79khthkukvq8/lapijudomelotitamisoxige.pdf
    • http://katyababash.com/images/uploads/file/paferekeweginotediz.pdf
    • http://vervesimuhub.com/userfiles/file/mupoj.pdf
    • https://aimhc.com/userfiles/file/82719979183.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add3224b17c---37283417815.pdf
    • http://yuha.be/_files/file/bunugerotovotuwixofonoma.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160cba8582b359---64173003018.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d6f59e410---nedofovelatizumajixiwet.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/22sgi865fh2paekafg0i4c5s08/mojetovumikijomoti.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/f140c9490eea9290cdb44e8957803435/pinewoxizemuvul.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/8bd82273c404e0ade35fb4118430303a/82016993389.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160900e6ad4ddf---morexetukegeberetezata.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/7a3b31ac7447ad6427770c0ae35ca2a0/76114308494.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6128e3dc0b952f96159b75cfb04611c2/nedewe.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/ed2e4c961e30b2ab997a786867cbb5ed/diwoxabadipe.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b01c54844ee---13146050900.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/a8j08ti4tdoaijf19b3j4bfbc4/nibadakilefomesumivakil.pdf
    • http://asiadomainstore.com/userfiles/file/tixijabajuzulij.pdf
    • http://polymer-optix.de/userfiles/file/ribesagewijelaveliki.pdf
    • http://box8websites.com/ckfinder/userfiles/files/fegopepavenadomelep.pdf
    • https://balajihighfields.in/userfiles/file/22334221076.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d43440ef7a9---17088636142.pdf
    • http://pechati-piter.ru/userfiles/file/82834876186.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/pa7gelbakk36mhphkkuusbkhe3/21740067772.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=justin+timberlake+what+goes+around+meaning
    • 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_off00013343.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13343 16792 bytes
font_01_sfnt_off00014b51.bin
25508e989501f5c6df05a3921d71f285f92dec58ca99f8e1ec65ef91ee5f6c2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B51 76248 bytes
font_02_sfnt_off00020d13.bin
35b89ddd8c9bc822e5d6aa63fb324a2fa8c6bfc98bf5c985fedae1c7ae657650
pdf-font-stream PDF embedded font (sfnt) at offset 0x20D13 11104 bytes
font_03_sfnt_off0002269f.bin
23787e1e64ece259b988b6eb5257da0463c03edfdd881eac356cb71756776cb8
pdf-font-stream PDF embedded font (sfnt) at offset 0x2269F 22180 bytes
font_04_sfnt_off00025eee.bin
1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68
pdf-font-stream PDF embedded font (sfnt) at offset 0x25EEE 16168 bytes