Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9870b2bae5f3f2…

MALICIOUS

PDF

79.5 KB Created: 2021-09-01 06:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c44942665f26653e681d98424a156de3 SHA-1: 0791b8583e14410e534301f71dc1328e9c64457e SHA-256: 1b9870b2bae5f3f2fbe47a5c4433c074e9c58acabcc1fe1d115000f0eb6533c7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • 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://cructi.ru/uplcv?utm_term=the+latin+dictionary PDF link annotation
    • https://epiphanych.com/images/file/91624253157.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/belobexa.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8c1d40eefef75026b164ab34193de5c1/64907592106.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a96472e70---fepiwatidetutazesodonax.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/4apg71u869ultuncvqsrvrgj99/44274450189.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/4isa2fqkdp57rls6q8uii3t03o/59087086707.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/6447747985.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/maruvuvanetagorojemebale.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/nanafonurokaxi.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/v38oc1qnrl0q7hb7rcr1ckefc2/28705869170.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/67909719994.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/kizarezogetarojijejawupub.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/46564680512.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/907a566217ab3a174e53c52995241ddb/55454166330.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/4523455069.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8db1dc4a4---sureruneboruzon.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/70177637540.pdfIn PDF document text
    • https://path.mn/userfiles/files/setuju.pdfIn PDF document text
    • https://isosklo.cz/uploads/74045898976.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e90e94cf653.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a0524118ca---22880975935.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/95555192593.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160af9f09880d9---wogulabidifa.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b0a9d38c1---gemoga.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/7a68011cd8d642f67eeacfc3859114f4/sufatezabojelinapizezaro.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_off0000d4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D0 17072 bytes
SHA-256: fc60a6697d07abcba2b74c58b66ec221faa8db87d83cfa4bb727f844e5c404ea
font_01_sfnt_off0001007f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007F 10376 bytes
SHA-256: dbc6fea8a606ba070dddee2255cf8cd3c5f86d1cf267dac403fb5d2279e67253
font_02_sfnt_off000117e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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