Malicious PDF — malware analysis report

Static analysis result for SHA-256 286ccff879ae2cd7…

MALICIOUS

PDF

86.5 KB Created: 2021-08-08 00:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: be85ab774198a631a7928ff4d788d3c7 SHA-1: 1905fa61091c05b378a4fce8fd344b994fdc4bf2 SHA-256: 286ccff879ae2cd768565c0e30c475ae9a054d00b0adec7700c661f6c59afa20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, characteristic of a link farm used for phishing or distributing further malware. The presence of these links suggests an attempt to redirect users to malicious content, likely as part of a phishing campaign or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=how+to+use+bluedriver+obd2 PDF link annotation
    • http://jagodkaprzedszkole.pl/userfiles/file/28222224530.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ba832e3a3---6784224729.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7fda384f18---64761523963.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/41b9c6kmrp3l8v8i8fl5nuqc54/18805945484.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/40709744487.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/gexanu.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/xinatinariravexakebemum.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/rarimikon.pdfIn PDF document text
    • http://designfromall.it/userfiles/file/75543786871.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04e7f6e772---kodutavakiwigoxokuwuba.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b889500001a---50197064702.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/7951372585.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/5500b26f10441f4f95adf6cdec3becfa/32197514078.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/31702696391.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/sfulmhoeetm1jbj44n8kebu1kk/36925704081.pdfIn PDF document text
    • http://www.celso.org/download/12060169981.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/gelubidowofubif.pdfIn PDF document text
    • http://www.heksan.com.pl/file/42310162715.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/robuweweg.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/tezakiketosotavanokal.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/3vppulvnb1lc4ksqc5kku4ab9s/xakofogefis.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/filegavubuxulibi.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/29959736469.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_off0000ee7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7D 16984 bytes
SHA-256: 982491c9f3c79b42cb0c62403a6a327d798909482a7b44d18420b1b8ea86452d
font_01_sfnt_off00011aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13302 10480 bytes
SHA-256: 59ab80a570a0d3ccc3033b5626566c971bbedb619b1cd0f46e75218e661fc974

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