Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4e1140548bf30d8…

MALICIOUS

PDF

109.1 KB Created: 2021-06-17 21:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: ec43ba14cad64bc99bb4221dac339d58 SHA-1: 5b75a4ea7cf7f3f3614ba5ef397d8a3d0efe8ac1 SHA-256: f4e1140548bf30d863b270daaaec16040264b353f5339ad1a775f9b43ac68e9b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The 'SE_CLICKFIX' heuristic indicates the document likely contains instructions to trick the user into running a command, a common tactic for executing secondary payloads. While no scripts were directly extracted, the presence of embedded URLs and the overall structure suggest an attempt to lure the user into downloading and executing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607336a06d15f---55605260322.pdf In PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c573e1692e---xugod.pdfIn PDF document text
    • http://msiutilities.biz/documents/13151200340.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/79261983338.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/c01f307455dd8d6238ccbe3938ffdffb/44680198325.pdfIn PDF document text
    • http://1-cx.com/ckfinder/userfiles/files/gosamas.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/xomijoxuvi.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9fc7d1169---fijivamawilet.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/4sn0jjdknnll9q0eiomg10rqn5/vajek.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/d52aea37e63368db8fe390bded30c4dc/lisuge.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/41393647167.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608401995ca9e---mobipulefepakorizov.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/4243908385bf2df8873eb33ac641ea3b/muvobofidexuke.pdfIn PDF document text
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/37315590688.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/92547892932.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/c5f1adcd9bd60dd1af5a1601840670d4/34142783143.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-14/20210514084903929086.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/eb340f3be5414c774d090fd51e377ba5/78659217602.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=windows+10+sync+time+with+ntp+serverPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE260 44908 bytes
SHA-256: 84abb1991342f6841433bfc1a72af362c2a222d21664738730b3058cb2655669
font_01_sfnt_off00016b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B57 5532 bytes
SHA-256: aa4f3b63538950b72fc8713c3ebeb95a60287df3f52e42f3b2ccbdbb18163218
font_02_sfnt_off00017e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E24 10876 bytes
SHA-256: eaf2fcc9bafbca3518a940e9b1868c119c5c0ec5aad937382de80fda01985632

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