Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a26f54399ff3bc…

MALICIOUS

PDF

191.3 KB Created: 2021-06-28 06:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3991966d5e2f44bf004038fe27adf8a0 SHA-1: 573a3553ace85086cdca8c119a092ccd09265204 SHA-256: 20a26f54399ff3bcbda178a5a97cb86874f5cfc82f720f59e39ed6c50e861896
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to obscure the final destination. The presence of these links suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b14e211f073---wuwuvolemutujozipekiboje.pdf In PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/xadotadaw.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/18893658629.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ed4cb44f7---funodevagofonoxanas.pdfIn PDF document text
    • https://fallsplat.se/file/fadijawimukofivubus.pdfIn PDF document text
    • http://aurora-c.jp/files/files/mafomibirosojo.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/90638255719.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/28751929975.pdfIn PDF document text
    • https://castel.ro/userfiles/file/tofavesidubemitasu.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/tekofufevuxawe.pdfIn PDF document text
    • http://atek-ent.com/upload/file/sorevagugikodoxapipunelu.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/fiwopevifop.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/7d54fa5aim9hpsa81mjctmj5r3/jobusiguralorotatoxifimo.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/xuvirojegofuva.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/nugafabaxesurudev.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/22709891630.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/52ab54ebf4569f1165819c70dbefaacf/diboxemir.pdfIn PDF document text
    • http://tebsc.com/clients/84181/File/vedarebisiluwarejufu.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/dawebesu.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093f68d9290b---85596436673.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a7a94ae5a---80608579714.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0d8d5c4f5---5488224429.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=first+noble+truthPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00027bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27BD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000293e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x293E3 23836 bytes
SHA-256: 2b9d59b9d94520aa4fd5e3db084cf8787839b9b325d9f9c8fc65b4a9e928810f
font_02_sfnt_off0002ccce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CCCE 2812 bytes
SHA-256: 74467581530465bd9e66f91dfad6695f3502ecc7098f25030a1e79c9dee0e51f
font_03_sfnt_off0002d86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D86D 10260 bytes
SHA-256: f44bcf2bb12de4915ba33acf06c938a6aaf98833984602b5b7ff80e6ebfd3cf8

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