Malicious PDF — malware analysis report

Static analysis result for SHA-256 1410a3fabb271584…

MALICIOUS

PDF

84.2 KB Created: 2021-09-16 04:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f19875cf3b0db9139df86193a673d373 SHA-1: a1b06c1d334958fd2eb14c8993167fc1551ad599 SHA-256: 1410a3fabb2715844e786da527355d89ebdc8a3f4c1338d1ff7994a24a289f4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic firings point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ketchas.ru/uplcv?utm_term=tiger777+slot+apk PDF link annotation
    • http://www.gonouvellezelande.com/files/xinazibodofonaz.pdfIn PDF document text
    • http://stylekd.ru/files/96799422486.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd86604642---tivefagusefoxejilunof.pdfIn PDF document text
    • http://www.520amis.com/upload/files/xigadumarojapi.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/kotobesugunejolabom.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/xupifi.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/vovikug.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613548efbecc9---64376248968.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/99359280683.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210901180706.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/21543351116.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/76276730481.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/fifivun.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/lejirorafika.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/52803810017.pdfIn PDF document text
    • https://kawanmto.com/contents/files/92394794481.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/41783014227.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/pepasitovujamiwax.pdfIn PDF document text
    • http://petrduchek.com/files/74476923916.pdfIn PDF document text
    • https://areicon.com/images/file/96193173771.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/merorusirulobojowaj.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/bl6estneuv2pai83hgrf6ga8s7/71131145965.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/nurigeponovelu.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_off0000d88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88D 22212 bytes
SHA-256: 0b636bede90fa2b43f7c49afe4e9b1e37a1076be160c2d6363b4469410f20820
font_01_sfnt_off000112e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E2 10428 bytes
SHA-256: ff299c45bf4c1adee4b15240e7cb09e8376a2f0b7b40f98cea2669eafa0969ea
font_02_sfnt_off00012ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1