Malicious PDF — malware analysis report

Static analysis result for SHA-256 db014f2bfcbd6ce0…

MALICIOUS

PDF

84.6 KB Created: 2021-09-15 19:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: efb291bd34eb76e3e722c4a934e17ee7 SHA-1: ae70e2b6804bb785c65f2d9773cb039b34df0be3 SHA-256: db014f2bfcbd6ce0efa209b8e6052a60d137a90f3fec64377e6b2535a5be66b9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external links, including those hosted on compromised CMS uploads and disposable hosting, suggests a phishing or malware distribution campaign. The heuristic 'SE_DOWNLOAD_BUTTON' further supports the lure-based attack pattern, aiming to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=a1+express+movie+online+watch PDF link annotation
    • http://kochamsushi.pl/UserFiles/file/bijafinibewuxokegi.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/6qb5kg1caq781lffn31ron01sa/55149699352.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/82v5b8bktm4k87l5d450ttonj6/67071551315.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/dazidikaxalomidado.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/naberitirexadi.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/bamasawewawuzufejo.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/xogemesex.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/namedebiguw.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/wukaribugewofigadazudafo.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/89117051886.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/vujuxokaziwire.pdfIn PDF document text
    • https://pixel.bg/img/file/69799063187.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/bilitatatitevufidifelir.pdfIn PDF document text
    • http://houselandia.ru/files/geluzugokakekukod.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/bugizawotenugobupanudo.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/dujuvobe.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613628edafada---volekitizozugomivizamefe.pdfIn PDF document text
    • https://arerp.kr/data/file///44581565289.pdfIn PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/lavusapiwajolatidamox.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/fujil.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/06/file/20210906_014602_137.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_off0000e1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AD 19052 bytes
SHA-256: a7a4731512ba6b98b99c51cb343f470032640a4e49e4703b3dbc0ba0804e1c71
font_01_sfnt_off0001139f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB6 10928 bytes
SHA-256: 4b4959b9af804c96126cf3ea73dab8345098573104c7e9ade38cf8ac8610b4c9