Malicious PDF — malware analysis report

Static analysis result for SHA-256 08811b16042a3a21…

MALICIOUS

PDF

68.6 KB Created: 2021-09-29 02:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4f5b7645395ccc1774f8bbca0d0f2caf SHA-1: f4fed03b2a618f991f1334cdda84d10096ba67f3 SHA-256: 08811b16042a3a210ddd148881cf18ce63a7dcd637d532d7d7175b80c688a0f3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=offline+android+emulator+for+pc PDF link annotation
    • https://hamasataccessories.com/userfiles/files/dawepomi.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/59208364254.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/39e324fa631343374b759451b0b881b6/putogetebepaj.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418270b2114---63594799995.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/siwavitulomijotap.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/xetavawobakaziseluf.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/mikibiromap.pdfIn PDF document text
    • https://icbacademy.com/upload/files/59978839718.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/piviwogenesopas.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/9f8bf880ce7f5ebc079170158fe74aff/74240924250.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384288b4caa---22639524361.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/121802732613fae2fbbff2.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/foruwonor.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/74064701293.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021092111532073499.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/khlbcg0gvhnla5a32kl7vqfold/85888564308.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/23158125358.pdfIn PDF document text
    • http://xhzhengli.com/upload/zonifukulawumugilofuf.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/39351132662.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/sumivaluvowured.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/14948810510.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/bawevunusozegetezivat.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/48122931794.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_off0000ad75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD75 15272 bytes
SHA-256: 68edb868b73f911221b194d0dd8f9fc5d1a98502a12e29e219dac36a1e7b9963
font_01_sfnt_off0000d468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD468 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7F 10736 bytes
SHA-256: 01abe4e35e1a121d9cdb3e2f7577a1f567b0310b080b28a7dda975280fe2f647

Open this report in the interactive analyzer, or submit your own file for analysis.