Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c623cba8579be9…

MALICIOUS

PDF

69.1 KB Created: 2021-09-22 14:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 46bfa696d8a2cda6b2cd85b30518e269 SHA-1: bd0c4995bcdf844e53bb63bb3db3fc5f13e18c0f SHA-256: f7c623cba8579be9769a01112ae5583ac2079d92d0c64e9461a815a3f1f19421
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. The heuristics indicate it functions as a link farm, directing users to various PDF files hosted on potentially compromised or disposable domains, with one URL specifically mentioning 'gta sa lite 7z' as a search term, suggesting a lure. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic strongly suggests the document's intent is to trick users into downloading a password-protected archive, likely to conceal a malicious payload from initial scanning. No scripts were extracted, but the overall pattern points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://chcial.ru/uplcv?utm_term=gta+sa+lite+7z PDF link annotation
    • http://studiomanzella.com/userfiles/files/77983927817.pdfIn PDF document text
    • https://equinox-e.com/upload/files/31635569037.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/99353417889.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/susimerovatomidi.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/73060124964.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/37766625828.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/jijarijefatenexevinavuzo.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/mesolufa.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/71216067068.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/88536179523.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/mejolixupiwi.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/laborejan.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/19764118509.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/zinisidiwirixifazoj.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdadfd1bc7---21429521541.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/1d067b8516dc8047f80702683ff8b1a7/62023657355.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/4d70f9faf7da91fc04f9e1f757930ebc/fesibinunurajikufelagew.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/kotorida.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/fupodituwalup.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210918164357.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/rabevobafigemidajepimu.pdfIn PDF document text
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/watavelo.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_off0000b152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB152 9924 bytes
SHA-256: 7897bd04dc421fad23662d8e3eaa84214bfbb38a32d0b917d4ebb2802aa7f35e
font_01_sfnt_off0000c777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC777 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF89 15568 bytes
SHA-256: cbc2c6d04276f75d0b3d765b333fa621e5120521259e7ecb1f6774aabbadfa99

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