Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca7b6a5aa5015bc6…

MALICIOUS

PDF

84.3 KB Created: 2021-09-06 03:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0d0f56006957a87af8cd55fb57d5ba9a SHA-1: aca5c73e823f00d5d5d428b0a3cf5564c113d0f8 SHA-256: ca7b6a5aa5015bc6362e860154c294a737a77642da87911e1662ab408045b2b7
156 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, indicating a phishing or redirection attempt. The PDF itself does not contain readable content, suggesting its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608871db0aede---66830120435.pdf In PDF document text
    • http://hakkabrothers.com/userfiles/file///putuzirakalubumumul.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/9628030170.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610dc073d3d70---4109747455.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/sdur4f2ti26a1rbgi1l0opaad1/25116310073.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074069e30bf9---58789643914.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607057cc8813e---giluzotoz.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609861aedcd93---bujatebejikorafizeziwaxit.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/26047106347.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/38558435014.pdfIn PDF document text
    • https://penal-garazh.ru/files/94070106773.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/83a31ebd1fe3fff2b54d5ec1b401d8bb/migegetedisejuwujede.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/daloxusuzopejalupazi.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/xozutesiv.pdfIn PDF document text
    • http://kesifveotesi.com/files/39841155121.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/67573663621.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085d9be270d8---62087507838.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/35473132253.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969e83b6995---fifirejogekega.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607658b851a84---mikefavomopipitasadozozo.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/mexukagotirimedafivi.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/54561917807.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/53758768644.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/39348114060.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/59142734807.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/fibapinew.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/zibilovosoke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=swearing+is+good+for+you+pdfPDF 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_off0000e5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DD 10904 bytes
SHA-256: ee3df17e5deb713eb746b97157ef485f2c9d6bf36b85aa06fc5b8bc5cd1ce561
font_01_sfnt_off0000ff0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0A 16912 bytes
SHA-256: fa97be6ee41c5a8f6e909ffb13a14592dcc79fe309879530c71ef79e8fdaaac4
font_02_sfnt_off00012b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1