Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ab28254110df750…

MALICIOUS

PDF

118.6 KB Created: 2021-06-08 18:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: bf5b9fd9e3a0ff5d651cc43f36c0cd0e SHA-1: a986029645088015f55365465ddfdbeea950cbd5 SHA-256: 2ab28254110df75095646b75997ca8dc40211fb9cc13f0f38826a9868c365330
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised WordPress sites, acting as a link farm. These links likely serve to obscure the final malicious destination, which is probably a phishing page or a malware download site. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://archism.ru/uplcv?utm_term=baal+veer+motu+patlu+ki+jodi PDF link annotation
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/917b6e6de87f7e8cf06eba2fe426a700/76970117704.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/eb5ec28a09cd1e9d07126547a8acdaf8/83203311668.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/1qha3fvf9i24f7ivi9o0ssucd7/88987102467.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/77030b8cf3f2fa83864ab48f8945d2d4/26498800534.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608461cf75c4c---nimipadulu.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/rowifiropopavajap.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4cf8281b9---riwakokavavekexowokagolek.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a487b13d2---filawikenabu.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160983a2aa34e9---genofakab.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/totowotezuvugegusuxiril.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/379ncuhr8k5mssq25aoojgkm3i/fobexabu.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073793a02193---34556397610.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/14568989193.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/84019157697.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/raa2bd2mvjon0drubt3hp03c35/61944808902.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/vbi17dch75ago1cotnt6mi2ql3/seradodi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18692 5176 bytes
SHA-256: acaead2b5fb4f3cce2df437450c16beef3a24a0d11641ba419e0653ad25b9ac0
font_01_sfnt_off00019822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19822 11368 bytes
SHA-256: 9c3a5eeac685a89309c9c23a7d6fad5ebe83a37668031200969484f6d9160549
font_02_sfnt_off0001bf04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF04 3500 bytes
SHA-256: bf39a0f37c0d05b1524cb22aa2c78aabdf357c1de6e7cfc47e5c68ae16810bf2