Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c6156b5506919b…

MALICIOUS

PDF

73.3 KB Created: 2021-09-19 10:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2bfda354967287fff140d5231f7025f3 SHA-1: cc7fba4b526a384294aeea7b33fd960131c8e9bc SHA-256: 27c6156b5506919bf03c57bcb3547770e821c49b36e3d73c6cf56806fdbc3caf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://infrive.ru/uplcv?utm_term=battle+city+2+player PDF link annotation
    • http://ebbers-schilderwerken.nl/uploads/files/93751360297.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/3235a9a9a59d0262ebd68a50c6785b5f/zolatu.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/28415671193.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210918_9902F6D7BC07743D.pdfIn PDF document text
    • http://diadiemvui.com/upload/files/jibakufi.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/defasukiwubafijadaduviwu.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/potenok.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/sozewiletuderivesino.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/4946660264.pdfIn PDF document text
    • https://irantruck.ir/data/file/71860008021.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/ntsdevnskdnp7e236jgokofs7t/79006690057.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/remiviruvibusira.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/lizopobituzafuduxo.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/69599900945.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/24e0947dcd56ed9f1fca120a7c8fae1a/sakipem.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/43523758218.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/japolideboki.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137944c417a5---46042819374.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/2489113520.pdfIn PDF document text
    • https://ratoempat.com/contents/files/xanemajifezujijelux.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/xatatuzirafiv.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/duvebada.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/67653716674.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97E 10260 bytes
SHA-256: c7bd4a0f1f6c0bc5e12a6d47695a237eaa7a0c150689950a3490289e2489ef3e
font_02_sfnt_off0000e0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C8 1760 bytes
SHA-256: 5fff00743cbca99111c2a7ac28d1b3d5d8f2da3a717fbbef75202c4a137a6772
font_03_sfnt_off0000e90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90F 18976 bytes
SHA-256: f520ddf206ee6edd59cff4c06004046639af07bc959f30a18fac66b113f54246

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