Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bac11f49e1da475…

MALICIOUS

PDF

72.2 KB Created: 2021-09-20 11:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a8e5c088e01a085f9563ff81525fe6b2 SHA-1: 18e14b94e7fd60910a6e985253a2cc9d8d29a52d SHA-256: 4bac11f49e1da475e884c74cca82ac4d696d2ff45a16049c463778ca584b2e60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://philabc.ru/uplcv?utm_term=glencoe+pre+algebra+resource+masters+pdf PDF link annotation
    • http://villaelen.it/userfiles/files/dasisagipejopimibeboribo.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/nujewa.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/81005293362.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/6393695327.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/466f0445da61d1d7b69441ad9da15be4/31799503441.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/10647910610.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/30402777300.pdfIn PDF document text
    • http://zeci.nl/im/image/navosiji.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161429472c2131---96328343351.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/jgc41e7b21aet30a3gj898qr5s/51128531075.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/nulevijojoxipa.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/kelud.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/mujilumowejexugunikumid.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091219173046.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/512d4e68b9c0ae0819f98937fb533104/samovigilozizagonujipaxi.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/piziparew.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/lolalomepirejufikobefi.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/paxejirepafe.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/59442424434.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/3e6d95792182d1882e9c094e8431a613/xaxojuwojadozujonipobes.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/61067572155.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/31822841200.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/rurapoge.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/jujosipobi.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/subibufedaxokazusenadawa.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210903_33C3ECA0AFDF24E3.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_off0000b87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB87A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD091 11148 bytes
SHA-256: c903c693bf1dc6d460e54858223361a722bf56bd87b61a6b4719ab2149d2d6bc
font_02_sfnt_off0000ea3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3A 16064 bytes
SHA-256: f347e57c483820a13e016859a51c1f51ce6fc1ce23ec3a97d0b496578d31ffaa

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