Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2f9f151ee318fe1…

MALICIOUS

PDF

73.8 KB Created: 2021-09-01 06:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 447814ec133bd3342eace72687fe85bd SHA-1: 98ae0c7138e0ff3a25b7b2730935aaa5f00f42a4 SHA-256: a2f9f151ee318fe13b120bd1c9998c6771b8414f99c61ce3ccbb7fc33def34a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of external URIs and a link farm structure strongly implies a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=washing+machine+not+cleaning+clothes PDF link annotation
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/39134361506.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/daeq08hf1ld1idorc2jp7kv3mt/26906475074.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/9380734160.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/161218601bb9ec---logijinomodisuterop.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/muzimibolezepavezizupuxes.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/9d088aa7f943634e827feac51934d3ad/pedadijajaru.pdfIn PDF document text
    • http://geraldinekilkelly.ie/zuxipimonazobisujiwek.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611c6001bb356---rebatolexix.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/65009258298.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/faboxefixenixus.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/4222168290.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/wuwuwodifavawi.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/rexabukubogobowufot.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/pizirojegegabo.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084476a9c490---jitoxukamizixusedizafo.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/paliwuxufatiman.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/33302547813.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/7907181891.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/13959430943.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/nitifimubem.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/25786970057.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/6f135ec3fcc6084c2e6e2bf96c62c039/zumigog.pdfIn PDF document text
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/80673346110.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b66c48b4d4b---musegiwarereki.pdfIn PDF document text
    • http://fxmeat.com/upload/file/9e51f84d419b293158684b7c5d194545.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_off0000c342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC342 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB59 10568 bytes
SHA-256: ea7120a98c8fafc19410040f19c5044a3ebcd50e082b2f4e51db3342683eeab7
font_02_sfnt_off0000f34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34C 14852 bytes
SHA-256: 3f5c22a5ea6a0f4440b1645a4a3b9a4db3a865941d72f31ef531683a4ca961dc