Malicious PDF — malware analysis report

Static analysis result for SHA-256 db16d5901ebc94d7…

MALICIOUS

PDF

84.5 KB Created: 2021-09-06 03:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 75a1c85ec8b1aa67ab9edd96122ba7ef SHA-1: f33197b4e35b7b2ccd5378e61dfd0bc8a029264e SHA-256: db16d5901ebc94d788801111112ab185f740cc304893d6d809dfe162174e7de4
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://auf.vn/wp-content/plugins/super-forms/uploads/php/files/vtfkr515giomnao8uhkv7l8va5/kilewojepotavavumulojokof.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2c692c4b9---86463421995.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/48839680235.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/59726558579.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/buladuduxolegik.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/totimuradipetakexatasode.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/pubemafesukitozer.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/pimiguvagugibijavakut.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/68420313531.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/mixabokekimetazig.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/35271518586.pdfIn PDF document text
    • https://birudongker.com/contents//files/48377553867.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e763a38ac8---gokegojigige.pdfIn PDF document text
    • http://wdnederland.nl/file/3012463547.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/9tjniah3vat1tro32vu3cbs3j1/mugesavi.pdfIn PDF document text
    • http://kaies.net/upfiles/file/rolobobumimavamipujejomep.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/ta3ckbfpibf757kvslabk1pdb3/94006377041.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a512ac23f20---dazevaxibudivujapatotiku.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/wufupujuto.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/lokerelezakobu.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/39749602275.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/89178bf9d354236b74d6b7b147630564/romazenapezigifaz.pdfIn PDF document text
    • http://hghs61.com/clients/9/98/9814c5f28b4e93efd1f74733a9fd6b0f/File/84109887618.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/mopavuk.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/264488a445c011c5d7897b1a6bdcfdc7/xerakovewewi.pdfIn PDF document text
    • http://scarpatti.com/files/80859516370.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/901ihm9vfqik45m2v3icklgtgk/81373948248.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=computer+virus+and+antivirus+pdfPDF link annotation
    • 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_off0000e69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69E 17388 bytes
SHA-256: 444dffe3e93cac8908a0f4dbda9ecd398613ba253dde2088a04e969dc5696c06
font_01_sfnt_off0001134b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134B 10808 bytes
SHA-256: 40df058bbe20fec80c192563add03b374aefb50e975b1c112708e3bf32032399
font_02_sfnt_off00012c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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