Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa4a1ad34f567ead…

MALICIOUS

PDF

84.3 KB Created: 2021-09-20 09:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f2883c9dc2351c991616792ff3a89f2c SHA-1: 8e2a372c459e5c4fc96f67336d6081e17650e564 SHA-256: fa4a1ad34f567eade650ca4838ac5f4bec4a114601032e673b54f89ab399b54b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the true destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution through these links. The file's structure and URL patterns suggest it's intended to lure users into clicking malicious links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/b8956a9c785a9af811e770f14928b390/60759190187.pdf In PDF document text
    • https://benhgout.net/uploads/Files/file/molax.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/93365370398.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/bebasovemivuniv.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/57927857079.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/jajewenavodid.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/liburefotavisafi.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/22373556956.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/kuvojezor.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/munukaxubew.pdfIn PDF document text
    • http://snkpost.com/fckedit_file/file///20210919_9_56_25.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/17202026892.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/rofagumajuvofemet.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613059c1c20b5---nanituvigewusone.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/75213826061.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/jujakumom.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371a57179c3---nakizur.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/gevikedavewosizi.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/cc36e7ccaaac0eb3e577fb3ed63505c5/nepilanodedasupamesomika.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/6898627232.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/28039158392.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210916015833.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/f8mr9fgd5e9uv1kq07tjfjq037/2409735485.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/pemuwovagefuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=grob%27s+basic+electronics+11th+edition+solutions+pdfPDF link annotation
    • 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_off0000e1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AA 11080 bytes
SHA-256: edb045091c5c0161f5a173dd40cc37b5212e873e4655b4900e1daeb155427aaf
font_01_sfnt_off0000fb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB44 18452 bytes
SHA-256: b4c6968a26d9f678ec8b4c049f691ed583674b41bc268885530b34f8988bd890
font_02_sfnt_off00012acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1