Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e37a25b973ead03…

MALICIOUS

PDF

90.8 KB Created: 2021-07-03 12:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e321b14712a0b721f03ff8aa30a8d5fc SHA-1: c18821fd689d7fa03d5aa958db8e2c5e65364ba5 SHA-256: 5e37a25b973ead0308f4b8bf921018bd44fbf009514f6df2dc19885b6ba77b2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the PDF format can embed JavaScript, and the overall structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://oniceh.ru/uplcv?utm_term=first+thoracic+ganglion PDF link annotation
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/880be9db6fe7ef62a35707c54a555140/23240925835.pdfIn PDF document text
    • https://ienter.bg/files/gulalabijevafefaketa.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/597567858f42108a2ff7b2fd6ddd3c1c/21100149393.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/28339950550.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/dewijolazutekapelobosa.pdfIn PDF document text
    • http://trekkingsapatours.com/upload/files/xufuromijot.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a931d610efd---69083282832.pdfIn PDF document text
    • https://oversaslogistica.it/file/15229349515.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/wavavenusitekebo.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d25573d01a0---fabevalumabi.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/cab2ba06f0ee22ba42a6cf2c894112f1/5373663647.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/sepisevitagapobaluvap.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/75c606314e24d5131e0fa37d084620bd/86704971453.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bf686fcca61---puwik.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160aca368f1d25---13068364824.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/2422575635.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/e5c6faae6d9658185fd16476852731fe/42902091470.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/e4c110b6a94b613e4a67c74163c0c17b/28689323392.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/1e3de6bb91bdd7a8de24b01aa467322b/83560269404.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d20548a239---jizoviripidejojefu.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/1555722564.pdfIn PDF document text
    • http://falerisztika.hu/tmp/41622827099.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bd622988f---14251897858.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/40224581285.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_off0000ffbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBB 18196 bytes
SHA-256: 818d8279e21ee4766d9bd6e9f198f0f9f788b0b107568d4479743b80add84167
font_01_sfnt_off00012ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000146dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146DC 10356 bytes
SHA-256: 68753a4cf168025559b9b2dc6ebc741ba3d6683a5b740fb1ad1a7bf6f3dae592