Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3479178ce8db35a…

MALICIOUS

PDF

82.9 KB Created: 2021-07-13 18:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 059518f57a54522df400297882e3176b SHA-1: 694081488415d4eeb343c54a44060f399a493020 SHA-256: d3479178ce8db35a899bed22373ed7145717aab2f11c335e43bf01bf15e40a70
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The 'SE_CLICKFIX' heuristic indicates the document likely contains social engineering to trick the user into executing a command, potentially leading to further payload execution. The numerous URLs found within the document, many hosted on compromised WordPress sites, suggest a link farm designed to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bb96371c5---pijavunonol.pdf In PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607668c62c201---85388593701.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/04npmssarnfvp4v0fdt4166p4g/5775078124.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/ligubakolipog.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075956446768---losuvaku.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/6647ac031b717dd578c6caedea406619/91005852881.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/e0ed66ad0263cedb0bdf9c7c7a0d697e/tigazotafixemifi.pdfIn PDF document text
    • http://limoride.net/gallery/file/8325636587.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a774589cb8---tajubexujupebixe.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160801ad861371---wodogururikigus.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/fa390fb6b58446cb153991355791089f/43197848038.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/70jclb4sc1f844l4cuh8dvbbd2/kejakezumiz.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607544b26ebb5---72765479781.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/4275562303.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/69798525810.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160af7553ee70d---zozudafumutol.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/80360617413.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608850d018187---9340942382.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/nezilila.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/botipuzi.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/8de2f7822c9ada9a8b3840d539dcd776/65420076762.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/fopiwalozoderudipiniguf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+increase+vram+in+pcPDF 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_off0000e0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D8 10632 bytes
SHA-256: 3936f9ceb6c524939308c45af1d068a15d84c13ced4cb622c1a7ebb0bed83825
font_02_sfnt_off00011133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11133 16900 bytes
SHA-256: 9c9542f66b81879cf8fec1fafa050546c43559e4860125fa52f5529b0157d037

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