Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2d877212a9af681…

MALICIOUS

PDF

85.9 KB Created: 2021-07-04 07:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4525264847272c57d3889efe052d82ca SHA-1: f3d3bad10a56aac86fd12ce88d74a4bb0cf9e1cd SHA-256: e2d877212a9af681bdc56f63a3e539bd742d5b6876056232dfe532e12e5d8613
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The PDF structure and embedded links are consistent with a spearphishing attachment designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3e44228d7---94763782452.pdf In PDF document text
    • https://burgas-remonti.com/userfiles/file/bafimamuminexamik.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/a29f3989d74d70cf04230af4793c6949/44260862598.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ae77261d8---91874281999.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/77635603355.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af968cbe046---60191940015.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/4878f5100903aefa603bf8b0ec760ac9/zegujatozademufufu.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/a0fed2186911f271dc84e58f1f2d1cc8/93552006727.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/91548312174.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/11814819624.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/rowuvenopini.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/wibafetiwas.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16089e81d151ef---lodawesunov.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/ratepejibezanefuxana.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/keket.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/981872001.pdfIn PDF document text
    • http://gute-reise.ru/i/files/files/68168806082.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/650tolde7ubgle9in6fnd7ujko/94234456229.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a582b9101---40407561568.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/zuloro.pdfIn PDF document text
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/54516293107.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa75004578---mizisoxo.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/13669090294.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a1eb9b80979---89477504613.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5dbe1ad9b6---muzoduteradof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=at+speed+crossword+cluePDF 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_off0000edeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEB 10316 bytes
SHA-256: aa230f26a822f0d5f8224b745dac44d9ae29e83878e67080b76d7e8307f582e4
font_01_sfnt_off00010565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10565 17316 bytes
SHA-256: df15158e49e0f326ac4fd8ee31c1a18b1ec6a4a043a2041a5cd3c171b0f4f9e1
font_02_sfnt_off00013243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13243 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1