Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab389a1892827fe1…

MALICIOUS

PDF

83.6 KB Created: 2021-07-16 22:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3423675ee6b566ae1cca739dd9676d3c SHA-1: 1d9310706b7a1a269af0eeb7645da26fe84e7a1d SHA-256: ab389a1892827fe17ca921d55384e2f6aa442b4b1e3941952402f901f64aeda6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV both strongly indicate maliciousness. The PDF contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. These links likely serve as lures for phishing or to download further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/tikusumepamisasu.pdf In PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160c42fceba950---fenesekapefoxuwofabatuko.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/92089511942.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/7fbda581038edc91655c4366ab504e5f/pituvepalurupiwavadul.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160abaafca9578---tonedubawosorokexipinum.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962d40eb185---44248750656.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/5746bfb0b187294098d49de5a952559b/dirulegud.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/115f71180ec9919b48bfb99d0b568e58/xirexixafusadapikila.pdfIn PDF document text
    • https://basisnomor.com/contents//files/dunixexotojiju.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/kizasumetazuro.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c03a6b94f4---32777959417.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b029d66df---xaresitavebomozoxiti.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/g81gtrujgrb2ng73gjbqi2ssm6/57419271344.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/wesan.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/39798394478.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/jetidoleketakotojimet.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16073caa5f21f6---80746072834.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/ro95ur49i51dkm1q5g446tb2lr/43574769319.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/19367838793.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/22780876259.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/33105574094.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/ddafdaafa41ff252154a8557fa19a036/zinusivinatalosaka.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/93815893299.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/54e6a10d6df890fae6096dc683ba3818/58519958876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=blue%27s+room+silly+seatPDF 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_off0000e517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE517 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2E 10464 bytes
SHA-256: 0fcd2678ded2dc760fe9ccd3338063e27718ea5cdeccd5a223a2a6a7f27c764f
font_02_sfnt_off00011519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11519 17072 bytes
SHA-256: d1cd80cf334e5764277c6d63701a5661a94952742268fe8569831f65e0e4db3c